"Rickey Whitworth" <rickey@community.nospam> wrote in message
news:ev1nvr0%23FHA.4028@tk2msftngp13.phx.gbl...
>I have a page with two web controls - a drop-down list of server names and
>a gridview that shows details about that server. The gridview is using the
>drop down list as a parameter, so changing the selected server in the
>drop-down list causes a postback and the gridview updates to the new
>server.
>
> What I would like to do is add the ability to pass a querystring to the
> page similar to the following:
>
> http://somewhere.com/servers.aspx?server=server1
>
> so that when the page loads, server1 is pre-selected. I also want the
> ability to change the server name once I get to the page if I need to.
>
> I thought about binding the gridview to the querystring, but I cannot
> figure out how to make the querystring change on postback.
>

| X-Tomcat-NG: microsoft.public.dotnet.framework.aspnet.webcontrols
|
| I have a page with two web controls - a drop-down list of server names
and a
| gridview that shows details about that server. The gridview is using the
| drop down list as a parameter, so changing the selected server in the
| drop-down list causes a postback and the gridview updates to the new
server.
|
| What I would like to do is add the ability to pass a querystring to the
page
| similar to the following:
|
| http://somewhere.com/servers.aspx?server=server1
|
| so that when the page loads, server1 is pre-selected. I also want the
| ability to change the server name once I get to the page if I need to.
|
| I thought about binding the gridview to the querystring, but I cannot
figure
| out how to make the querystring change on postback.
|
|
|

"Steven Cheng[MSFT]" <stch***@online.microsoft.com> wrote in message
news:%23B99c95%23FHA.3764@TK2MSFTNGXA02.phx.gbl...
> Hi Rickey,
>
> For the GridView control, it can accept the filtering parameter only from
> single source(control or querystring...), so would still use the
> DropDownList as the filtering control to change the GridView's displaying
> data when postback?  If so, I think we'd better remain using the
> Dropdownlist as the GridView's select parameter source....   And as for
> querystring , since we just use it to initialize the Dropdownlist when the
> page first time load, so I think we can just manually add some code to
> parse the querystring and set the DropDownList's selected value in
> Page_Load (when not postback....).  For example:
>
> protected void Page_Load(object sender, EventArgs e)
>    {
>        if (!IsPostBack)
>        {
>            string cid = Request.QueryString["cid"];
>            if (cid != null && cid != string.Empty)
>            {
>                DropDownList1.SelectedValue = cid;
>            }
>        }
>    }
>
> Hope helps. Thanks,
>
> Steven Cheng
> Microsoft Online Support
>
> Get Secure! www.microsoft.com/security
> (This posting is provided "AS IS", with no warranties, and confers no
> rights.)
>
> --------------------
> | From: "Rickey Whitworth" <rickey@community.nospam>
> | Subject: Understanding query strings
> | Date: Wed, 7 Dec 2005 10:25:19 -0600
> | Lines: 17
> | X-Priority: 3
> | X-MSMail-Priority: Normal
> | X-Newsreader: Microsoft Outlook Express 6.00.2900.2527
> | X-RFC2646: Format=Flowed; Original
> | X-MimeOLE: Produced By Microsoft MimeOLE V6.00.2900.2527
> | Message-ID: <ev1nvr0#FHA.4***@tk2msftngp13.phx.gbl>
> | Newsgroups: microsoft.public.dotnet.framework.aspnet.webcontrols
> | NNTP-Posting-Host: 66.182.150.119
> | Path: TK2MSFTNGXA02.phx.gbl!TK2MSFTNGP08.phx.gbl!tk2msftngp13.phx.gbl
> | Xref: TK2MSFTNGXA02.phx.gbl
> microsoft.public.dotnet.framework.aspnet.webcontrols:31607
> | X-Tomcat-NG: microsoft.public.dotnet.framework.aspnet.webcontrols
> |
> | I have a page with two web controls - a drop-down list of server names
> and a
> | gridview that shows details about that server. The gridview is using the
> | drop down list as a parameter, so changing the selected server in the
> | drop-down list causes a postback and the gridview updates to the new
> server.
> |
> | What I would like to do is add the ability to pass a querystring to the
> page
> | similar to the following:
> |
> | http://somewhere.com/servers.aspx?server=server1
> |
> | so that when the page loads, server1 is pre-selected. I also want the
> | ability to change the server name once I get to the page if I need to.
> |
> | I thought about binding the gridview to the querystring, but I cannot
> figure
> | out how to make the querystring change on postback.
> |
> |
> |
>

| X-Tomcat-NG: microsoft.public.dotnet.framework.aspnet.webcontrols
|
| Thank you, that is what I was trying previously, but I thought it might
be
| the wrong approach. It was working, then I started getting this error:
|
| An error has occurred because a control with id
| 'ctl00$ContentPlaceHolder1$GridView2$ctl04$ctl00' could not be located or
a
| different control is assigned to the same ID after postback. If the ID is
| not assigned, explicitly set the ID property of controls that raise
postback
| events to avoid this error.
|
| I added an @Trace directive to the page to identify which control
| ctl04$ctl100 was, and determined it was the pager control. If I disable
| paging on the gridview, the problem goes away.
|
| The problem only happens in this situation:
| 1) I navigate to the page using a querystring (which then selects the
| appropriate value from the dropdown list)
| 2) I then select a different value from the drop down list
|
| the error says to explicitly set ids of controls that cause postback, and
I
| assume a pager control causes postback, but how do I set its ID?
|
| "Steven Cheng[MSFT]" <stch***@online.microsoft.com> wrote in message
| news:%23B99c95%23FHA.3764@TK2MSFTNGXA02.phx.gbl...
| > Hi Rickey,
| >
| > For the GridView control, it can accept the filtering parameter only
from
| > single source(control or querystring...), so would still use the
| > DropDownList as the filtering control to change the GridView's
displaying
| > data when postback?  If so, I think we'd better remain using the
| > Dropdownlist as the GridView's select parameter source....   And as for
| > querystring , since we just use it to initialize the Dropdownlist when
the
| > page first time load, so I think we can just manually add some code to
| > parse the querystring and set the DropDownList's selected value in
| > Page_Load (when not postback....).  For example:
| >
| > protected void Page_Load(object sender, EventArgs e)
| >    {
| >        if (!IsPostBack)
| >        {
| >            string cid = Request.QueryString["cid"];
| >            if (cid != null && cid != string.Empty)
| >            {
| >                DropDownList1.SelectedValue = cid;
| >            }
| >        }
| >    }
| >
| > Hope helps. Thanks,
| >
| > Steven Cheng
| > Microsoft Online Support
| >
| > Get Secure! www.microsoft.com/security
| > (This posting is provided "AS IS", with no warranties, and confers no
| > rights.)
| >
| > --------------------
| > | From: "Rickey Whitworth" <rickey@community.nospam>
| > | Subject: Understanding query strings
| > | Date: Wed, 7 Dec 2005 10:25:19 -0600
| > | Lines: 17
| > | X-Priority: 3
| > | X-MSMail-Priority: Normal
| > | X-Newsreader: Microsoft Outlook Express 6.00.2900.2527
| > | X-RFC2646: Format=Flowed; Original
| > | X-MimeOLE: Produced By Microsoft MimeOLE V6.00.2900.2527
| > | Message-ID: <ev1nvr0#FHA.4***@tk2msftngp13.phx.gbl>
| > | Newsgroups: microsoft.public.dotnet.framework.aspnet.webcontrols
| > | NNTP-Posting-Host: 66.182.150.119
| > | Path: TK2MSFTNGXA02.phx.gbl!TK2MSFTNGP08.phx.gbl!tk2msftngp13.phx.gbl
| > | Xref: TK2MSFTNGXA02.phx.gbl
| > microsoft.public.dotnet.framework.aspnet.webcontrols:31607
| > | X-Tomcat-NG: microsoft.public.dotnet.framework.aspnet.webcontrols
| > |
| > | I have a page with two web controls - a drop-down list of server names
| > and a
| > | gridview that shows details about that server. The gridview is using
the
| > | drop down list as a parameter, so changing the selected server in the
| > | drop-down list causes a postback and the gridview updates to the new
| > server.
| > |
| > | What I would like to do is add the ability to pass a querystring to
the
| > page
| > | similar to the following:
| > |
| > | http://somewhere.com/servers.aspx?server=server1
| > |
| > | so that when the page loads, server1 is pre-selected. I also want the
| > | ability to change the server name once I get to the page if I need to.
| > |
| > | I thought about binding the gridview to the querystring, but I cannot
| > figure
| > | out how to make the querystring change on postback.
| > |
| > |
| > |
| >
|
|
|

"Steven Cheng[MSFT]" <stch***@online.microsoft.com> wrote in message
news:$qICBHH$FHA.832@TK2MSFTNGXA02.phx.gbl...
> Thanks for your response Rickey,
>
> Seems the problem you met is specific to the pager, are you using the
> default build-in paging of GridView?  Also, does the code you used to set
> the dropdownlist's selected item the same as mine?   Based on my local
> test,  using the page_load to assign the SelectedValue worked correctly no
> matter I used paging or not......  Anyway, here is my test page's code(I
> also tested in master page scenaro......), you can have a test on your
> side
> to see whether it works....
>
>
> I just use the "Product" and "Categories" table in NorthWind database for
> testing......
> =========aspx=============
> <div>
>        <asp:SqlDataSource ID="SqlDataSource1" runat="server"
> ConnectionString="<%$ ConnectionStrings:LocalNorthWind %>"
>            SelectCommand="SELECT DISTINCT [CategoryID], [CategoryName]
> FROM [Categories]"></asp:SqlDataSource>
>        <asp:DropDownList ID="DropDownList1" runat="server"
> AutoPostBack="True" DataSourceID="SqlDataSource1"
>            DataTextField="CategoryName" DataValueField="CategoryID"
> OnDataBinding="DropDownList1_DataBinding"
> OnDataBound="DropDownList1_DataBound">
>        </asp:DropDownList>
>        <asp:SqlDataSource ID="SqlDataSource2" runat="server"
> ConnectionString="<%$ ConnectionStrings:LocalNorthWind %>"
>            SelectCommand="SELECT [ProductName], [ProductID], [CategoryID],
> [Discontinued] FROM [Products] WHERE ([CategoryID] = @CategoryID)"
> OnSelecting="SqlDataSource2_Selecting">
>            <SelectParameters>
>                <asp:ControlParameter ControlID="DropDownList1"
> Name="CategoryID" PropertyName="SelectedValue"
>                    Type="Int32" />
>            </SelectParameters>
>        </asp:SqlDataSource>
>        <asp:GridView ID="GridView1" runat="server" AllowPaging="True"
> AutoGenerateColumns="False"
>            DataKeyNames="ProductID" DataSourceID="SqlDataSource2"
> PageSize="3" OnDataBinding="GridView1_DataBinding"
> OnDataBound="GridView1_DataBound">
>            <Columns>
>                <asp:BoundField DataField="ProductName"
> HeaderText="ProductName" SortExpression="ProductName" />
>                <asp:BoundField DataField="ProductID"
> HeaderText="ProductID" InsertVisible="False"
>                    ReadOnly="True" SortExpression="ProductID" />
>                <asp:BoundField DataField="CategoryID"
> HeaderText="CategoryID" SortExpression="CategoryID" />
>                <asp:CheckBoxField DataField="Discontinued"
> HeaderText="Discontinued" SortExpression="Discontinued" />
>            </Columns>
>            <PagerSettings Position="TopAndBottom" />
>        </asp:GridView>
>
>    </div>
>
> =====code behind==========
> public partial class ListGridView : System.Web.UI.Page
> {
>    protected void Page_Load(object sender, EventArgs e)
>    {
>        if (!IsPostBack)
>        {
>            string cid = Request.QueryString["cid"];
>            if (cid != null && cid != string.Empty)
>            {
>                Trace.Warn("<br>DropDownList1.SelectedValue = cid;");
>                DropDownList1.SelectedValue = cid;
>
>            }
>        }
>    }
>    protected void DropDownList1_DataBinding(object sender, EventArgs e)
>    {
>        Trace.Warn("<br>DropDownList1_DataBinding");
>    }
>    protected void DropDownList1_DataBound(object sender, EventArgs e)
>    {
>        Trace.Warn("<br>DropDownList1_DataBound");
>    }
>    protected void GridView1_DataBinding(object sender, EventArgs e)
>    {
>        Trace.Warn("<br>GridView1_DataBinding");
>    }
>    protected void GridView1_DataBound(object sender, EventArgs e)
>    {
>        Trace.Warn("<br>GridView1_DataBound");
>    }
>    protected void SqlDataSource2_Selecting(object sender,
> SqlDataSourceSelectingEventArgs e)
>    {
>        Trace.Warn("SqlDataSource2_Selecting");
>    }
> }
>
> ==============================
>
> Hope helps. Thanks,
>
> Steven Cheng
> Microsoft Online Support
>
> Get Secure! www.microsoft.com/security
> (This posting is provided "AS IS", with no warranties, and confers no
> rights.)
>
>
>
>
>
>
> --------------------
> | From: "Rickey Whitworth" <rickey@community.nospam>
> | References: <ev1nvr0#FHA.4***@tk2msftngp13.phx.gbl>
> <#B99c95#FHA.3***@TK2MSFTNGXA02.phx.gbl>
> | Subject: Re: Understanding query strings
> | Date: Thu, 8 Dec 2005 15:10:40 -0600
> | Lines: 99
> | X-Priority: 3
> | X-MSMail-Priority: Normal
> | X-Newsreader: Microsoft Outlook Express 6.00.2900.2527
> | X-RFC2646: Format=Flowed; Original
> | X-MimeOLE: Produced By Microsoft MimeOLE V6.00.2900.2527
> | Message-ID: <ukGh3vD$FHA.***@TK2MSFTNGP15.phx.gbl>
> | Newsgroups: microsoft.public.dotnet.framework.aspnet.webcontrols
> | NNTP-Posting-Host: 66.182.150.119
> | Path: TK2MSFTNGXA02.phx.gbl!TK2MSFTNGP08.phx.gbl!TK2MSFTNGP15.phx.gbl
> | Xref: TK2MSFTNGXA02.phx.gbl
> microsoft.public.dotnet.framework.aspnet.webcontrols:31633
> | X-Tomcat-NG: microsoft.public.dotnet.framework.aspnet.webcontrols
> |
> | Thank you, that is what I was trying previously, but I thought it might
> be
> | the wrong approach. It was working, then I started getting this error:
> |
> | An error has occurred because a control with id
> | 'ctl00$ContentPlaceHolder1$GridView2$ctl04$ctl00' could not be located
> or
> a
> | different control is assigned to the same ID after postback. If the ID
> is
> | not assigned, explicitly set the ID property of controls that raise
> postback
> | events to avoid this error.
> |
> | I added an @Trace directive to the page to identify which control
> | ctl04$ctl100 was, and determined it was the pager control. If I disable
> | paging on the gridview, the problem goes away.
> |
> | The problem only happens in this situation:
> | 1) I navigate to the page using a querystring (which then selects the
> | appropriate value from the dropdown list)
> | 2) I then select a different value from the drop down list
> |
> | the error says to explicitly set ids of controls that cause postback,
> and
> I
> | assume a pager control causes postback, but how do I set its ID?
> |
> | "Steven Cheng[MSFT]" <stch***@online.microsoft.com> wrote in message
> | news:%23B99c95%23FHA.3764@TK2MSFTNGXA02.phx.gbl...
> | > Hi Rickey,
> | >
> | > For the GridView control, it can accept the filtering parameter only
> from
> | > single source(control or querystring...), so would still use the
> | > DropDownList as the filtering control to change the GridView's
> displaying
> | > data when postback?  If so, I think we'd better remain using the
> | > Dropdownlist as the GridView's select parameter source....   And as
> for
> | > querystring , since we just use it to initialize the Dropdownlist when
> the
> | > page first time load, so I think we can just manually add some code to
> | > parse the querystring and set the DropDownList's selected value in
> | > Page_Load (when not postback....).  For example:
> | >
> | > protected void Page_Load(object sender, EventArgs e)
> | >    {
> | >        if (!IsPostBack)
> | >        {
> | >            string cid = Request.QueryString["cid"];
> | >            if (cid != null && cid != string.Empty)
> | >            {
> | >                DropDownList1.SelectedValue = cid;
> | >            }
> | >        }
> | >    }
> | >
> | > Hope helps. Thanks,
> | >
> | > Steven Cheng
> | > Microsoft Online Support
> | >
> | > Get Secure! www.microsoft.com/security
> | > (This posting is provided "AS IS", with no warranties, and confers no
> | > rights.)
> | >
> | > --------------------
> | > | From: "Rickey Whitworth" <rickey@community.nospam>
> | > | Subject: Understanding query strings
> | > | Date: Wed, 7 Dec 2005 10:25:19 -0600
> | > | Lines: 17
> | > | X-Priority: 3
> | > | X-MSMail-Priority: Normal
> | > | X-Newsreader: Microsoft Outlook Express 6.00.2900.2527
> | > | X-RFC2646: Format=Flowed; Original
> | > | X-MimeOLE: Produced By Microsoft MimeOLE V6.00.2900.2527
> | > | Message-ID: <ev1nvr0#FHA.4***@tk2msftngp13.phx.gbl>
> | > | Newsgroups: microsoft.public.dotnet.framework.aspnet.webcontrols
> | > | NNTP-Posting-Host: 66.182.150.119
> | > | Path:
> TK2MSFTNGXA02.phx.gbl!TK2MSFTNGP08.phx.gbl!tk2msftngp13.phx.gbl
> | > | Xref: TK2MSFTNGXA02.phx.gbl
> | > microsoft.public.dotnet.framework.aspnet.webcontrols:31607
> | > | X-Tomcat-NG: microsoft.public.dotnet.framework.aspnet.webcontrols
> | > |
> | > | I have a page with two web controls - a drop-down list of server
> names
> | > and a
> | > | gridview that shows details about that server. The gridview is using
> the
> | > | drop down list as a parameter, so changing the selected server in
> the
> | > | drop-down list causes a postback and the gridview updates to the new
> | > server.
> | > |
> | > | What I would like to do is add the ability to pass a querystring to
> the
> | > page
> | > | similar to the following:
> | > |
> | > | http://somewhere.com/servers.aspx?server=server1
> | > |
> | > | so that when the page loads, server1 is pre-selected. I also want
> the
> | > | ability to change the server name once I get to the page if I need
> to.
> | > |
> | > | I thought about binding the gridview to the querystring, but I
> cannot
> | > figure
> | > | out how to make the querystring change on postback.
> | > |
> | > |
> | > |
> | >
> |
> |
> |
>

| X-Tomcat-NG: microsoft.public.dotnet.framework.aspnet.webcontrols
|
| Thank you for the response and the code sample. I believe this should
take
| care of my problem. I do have one question. If you go to the page you
| created and pass a querystring, the page loads, the drop down item is
| selected and the gridview is populated. But in my test, if I then change
the
| querystring in the address bar and hit enter key, the new item is
selected
| in the drop down box, but the gridview is empty. If I hit refresh it
| appears. Is this by design?
|
| Also, is there a way to make the querystring in the address bar change
when
| the drop-down list selected item changes? If not, the querystring is no
| longer valid once a different item has been selected, meaning that if a
user
| bookmarks the page, it will take them to the item in the querystring, not
| the new item they selected. If the querystring cannot be changed, can it
be
| removed from the url after loading so that at least it want appear?
|
|
| "Steven Cheng[MSFT]" <stch***@online.microsoft.com> wrote in message
| news:$qICBHH$FHA.832@TK2MSFTNGXA02.phx.gbl...
| > Thanks for your response Rickey,
| >
| > Seems the problem you met is specific to the pager, are you using the
| > default build-in paging of GridView?  Also, does the code you used to
set
| > the dropdownlist's selected item the same as mine?   Based on my local
| > test,  using the page_load to assign the SelectedValue worked correctly
no
| > matter I used paging or not......  Anyway, here is my test page's code(I
| > also tested in master page scenaro......), you can have a test on your
| > side
| > to see whether it works....
| >
| >
| > I just use the "Product" and "Categories" table in NorthWind database
for
| > testing......
| > =========aspx=============
| > <div>
| >        <asp:SqlDataSource ID="SqlDataSource1" runat="server"
| > ConnectionString="<%$ ConnectionStrings:LocalNorthWind %>"
| >            SelectCommand="SELECT DISTINCT [CategoryID], [CategoryName]
| > FROM [Categories]"></asp:SqlDataSource>
| >        <asp:DropDownList ID="DropDownList1" runat="server"
| > AutoPostBack="True" DataSourceID="SqlDataSource1"
| >            DataTextField="CategoryName" DataValueField="CategoryID"
| > OnDataBinding="DropDownList1_DataBinding"
| > OnDataBound="DropDownList1_DataBound">
| >        </asp:DropDownList>
| >        <asp:SqlDataSource ID="SqlDataSource2" runat="server"
| > ConnectionString="<%$ ConnectionStrings:LocalNorthWind %>"
| >            SelectCommand="SELECT [ProductName], [ProductID],
[CategoryID],
| > [Discontinued] FROM [Products] WHERE ([CategoryID] = @CategoryID)"
| > OnSelecting="SqlDataSource2_Selecting">
| >            <SelectParameters>
| >                <asp:ControlParameter ControlID="DropDownList1"
| > Name="CategoryID" PropertyName="SelectedValue"
| >                    Type="Int32" />
| >            </SelectParameters>
| >        </asp:SqlDataSource>
| >        <asp:GridView ID="GridView1" runat="server" AllowPaging="True"
| > AutoGenerateColumns="False"
| >            DataKeyNames="ProductID" DataSourceID="SqlDataSource2"
| > PageSize="3" OnDataBinding="GridView1_DataBinding"
| > OnDataBound="GridView1_DataBound">
| >            <Columns>
| >                <asp:BoundField DataField="ProductName"
| > HeaderText="ProductName" SortExpression="ProductName" />
| >                <asp:BoundField DataField="ProductID"
| > HeaderText="ProductID" InsertVisible="False"
| >                    ReadOnly="True" SortExpression="ProductID" />
| >                <asp:BoundField DataField="CategoryID"
| > HeaderText="CategoryID" SortExpression="CategoryID" />
| >                <asp:CheckBoxField DataField="Discontinued"
| > HeaderText="Discontinued" SortExpression="Discontinued" />
| >            </Columns>
| >            <PagerSettings Position="TopAndBottom" />
| >        </asp:GridView>
| >
| >    </div>
| >
| > =====code behind==========
| > public partial class ListGridView : System.Web.UI.Page
| > {
| >    protected void Page_Load(object sender, EventArgs e)
| >    {
| >        if (!IsPostBack)
| >        {
| >            string cid = Request.QueryString["cid"];
| >            if (cid != null && cid != string.Empty)
| >            {
| >                Trace.Warn("<br>DropDownList1.SelectedValue = cid;");
| >                DropDownList1.SelectedValue = cid;
| >
| >            }
| >        }
| >    }
| >    protected void DropDownList1_DataBinding(object sender, EventArgs e)
| >    {
| >        Trace.Warn("<br>DropDownList1_DataBinding");
| >    }
| >    protected void DropDownList1_DataBound(object sender, EventArgs e)
| >    {
| >        Trace.Warn("<br>DropDownList1_DataBound");
| >    }
| >    protected void GridView1_DataBinding(object sender, EventArgs e)
| >    {
| >        Trace.Warn("<br>GridView1_DataBinding");
| >    }
| >    protected void GridView1_DataBound(object sender, EventArgs e)
| >    {
| >        Trace.Warn("<br>GridView1_DataBound");
| >    }
| >    protected void SqlDataSource2_Selecting(object sender,
| > SqlDataSourceSelectingEventArgs e)
| >    {
| >        Trace.Warn("SqlDataSource2_Selecting");
| >    }
| > }
| >
| > ==============================
| >
| > Hope helps. Thanks,
| >
| > Steven Cheng
| > Microsoft Online Support
| >
| > Get Secure! www.microsoft.com/security
| > (This posting is provided "AS IS", with no warranties, and confers no
| > rights.)
| >
| >
| >
| >
| >
| >
| > --------------------
| > | From: "Rickey Whitworth" <rickey@community.nospam>
| > | References: <ev1nvr0#FHA.4***@tk2msftngp13.phx.gbl>
| > <#B99c95#FHA.3***@TK2MSFTNGXA02.phx.gbl>
| > | Subject: Re: Understanding query strings
| > | Date: Thu, 8 Dec 2005 15:10:40 -0600
| > | Lines: 99
| > | X-Priority: 3
| > | X-MSMail-Priority: Normal
| > | X-Newsreader: Microsoft Outlook Express 6.00.2900.2527
| > | X-RFC2646: Format=Flowed; Original
| > | X-MimeOLE: Produced By Microsoft MimeOLE V6.00.2900.2527
| > | Message-ID: <ukGh3vD$FHA.***@TK2MSFTNGP15.phx.gbl>
| > | Newsgroups: microsoft.public.dotnet.framework.aspnet.webcontrols
| > | NNTP-Posting-Host: 66.182.150.119
| > | Path: TK2MSFTNGXA02.phx.gbl!TK2MSFTNGP08.phx.gbl!TK2MSFTNGP15.phx.gbl
| > | Xref: TK2MSFTNGXA02.phx.gbl
| > microsoft.public.dotnet.framework.aspnet.webcontrols:31633
| > | X-Tomcat-NG: microsoft.public.dotnet.framework.aspnet.webcontrols
| > |
| > | Thank you, that is what I was trying previously, but I thought it
might
| > be
| > | the wrong approach. It was working, then I started getting this error:
| > |
| > | An error has occurred because a control with id
| > | 'ctl00$ContentPlaceHolder1$GridView2$ctl04$ctl00' could not be
located
| > or
| > a
| > | different control is assigned to the same ID after postback. If the
ID
| > is
| > | not assigned, explicitly set the ID property of controls that raise
| > postback
| > | events to avoid this error.
| > |
| > | I added an @Trace directive to the page to identify which control
| > | ctl04$ctl100 was, and determined it was the pager control. If I
disable
| > | paging on the gridview, the problem goes away.
| > |
| > | The problem only happens in this situation:
| > | 1) I navigate to the page using a querystring (which then selects the
| > | appropriate value from the dropdown list)
| > | 2) I then select a different value from the drop down list
| > |
| > | the error says to explicitly set ids of controls that cause postback,
| > and
| > I
| > | assume a pager control causes postback, but how do I set its ID?
| > |
| > | "Steven Cheng[MSFT]" <stch***@online.microsoft.com> wrote in message
| > | news:%23B99c95%23FHA.3764@TK2MSFTNGXA02.phx.gbl...
| > | > Hi Rickey,
| > | >
| > | > For the GridView control, it can accept the filtering parameter only
| > from
| > | > single source(control or querystring...), so would still use the
| > | > DropDownList as the filtering control to change the GridView's
| > displaying
| > | > data when postback?  If so, I think we'd better remain using the
| > | > Dropdownlist as the GridView's select parameter source....   And as
| > for
| > | > querystring , since we just use it to initialize the Dropdownlist
when
| > the
| > | > page first time load, so I think we can just manually add some code
to
| > | > parse the querystring and set the DropDownList's selected value in
| > | > Page_Load (when not postback....).  For example:
| > | >
| > | > protected void Page_Load(object sender, EventArgs e)
| > | >    {
| > | >        if (!IsPostBack)
| > | >        {
| > | >            string cid = Request.QueryString["cid"];
| > | >            if (cid != null && cid != string.Empty)
| > | >            {
| > | >                DropDownList1.SelectedValue = cid;
| > | >            }
| > | >        }
| > | >    }
| > | >
| > | > Hope helps. Thanks,
| > | >
| > | > Steven Cheng
| > | > Microsoft Online Support
| > | >
| > | > Get Secure! www.microsoft.com/security
| > | > (This posting is provided "AS IS", with no warranties, and confers
no
| > | > rights.)
| > | >
| > | > --------------------
| > | > | From: "Rickey Whitworth" <rickey@community.nospam>
| > | > | Subject: Understanding query strings
| > | > | Date: Wed, 7 Dec 2005 10:25:19 -0600
| > | > | Lines: 17
| > | > | X-Priority: 3
| > | > | X-MSMail-Priority: Normal
| > | > | X-Newsreader: Microsoft Outlook Express 6.00.2900.2527
| > | > | X-RFC2646: Format=Flowed; Original
| > | > | X-MimeOLE: Produced By Microsoft MimeOLE V6.00.2900.2527
| > | > | Message-ID: <ev1nvr0#FHA.4***@tk2msftngp13.phx.gbl>
| > | > | Newsgroups: microsoft.public.dotnet.framework.aspnet.webcontrols
| > | > | NNTP-Posting-Host: 66.182.150.119
| > | > | Path:
| > TK2MSFTNGXA02.phx.gbl!TK2MSFTNGP08.phx.gbl!tk2msftngp13.phx.gbl
| > | > | Xref: TK2MSFTNGXA02.phx.gbl
| > | > microsoft.public.dotnet.framework.aspnet.webcontrols:31607
| > | > | X-Tomcat-NG: microsoft.public.dotnet.framework.aspnet.webcontrols
| > | > |
| > | > | I have a page with two web controls - a drop-down list of server
| > names
| > | > and a
| > | > | gridview that shows details about that server. The gridview is
using
| > the
| > | > | drop down list as a parameter, so changing the selected server in
| > the
| > | > | drop-down list causes a postback and the gridview updates to the
new
| > | > server.
| > | > |
| > | > | What I would like to do is add the ability to pass a querystring
to
| > the
| > | > page
| > | > | similar to the following:
| > | > |
| > | > | http://somewhere.com/servers.aspx?server=server1
| > | > |
| > | > | so that when the page loads, server1 is pre-selected. I also want
| > the
| > | > | ability to change the server name once I get to the page if I
need
| > to.
| > | > |
| > | > | I thought about binding the gridview to the querystring, but I
| > cannot
| > | > figure
| > | > | out how to make the querystring change on postback.
| > | > |
| > | > |
| > | > |
| > | >
| > |
| > |
| > |
| >
|
|
|

"Steven Cheng[MSFT]" <stch***@online.microsoft.com> wrote in message
news:%23B99c95%23FHA.3764@TK2MSFTNGXA02.phx.gbl...
> Hi Rickey,
>
> For the GridView control, it can accept the filtering parameter only from
> single source(control or querystring...), so would still use the
> DropDownList as the filtering control to change the GridView's displaying
> data when postback?  If so, I think we'd better remain using the
> Dropdownlist as the GridView's select parameter source....   And as for
> querystring , since we just use it to initialize the Dropdownlist when the
> page first time load, so I think we can just manually add some code to
> parse the querystring and set the DropDownList's selected value in
> Page_Load (when not postback....).  For example:
>
> protected void Page_Load(object sender, EventArgs e)
>    {
>        if (!IsPostBack)
>        {
>            string cid = Request.QueryString["cid"];
>            if (cid != null && cid != string.Empty)
>            {
>                DropDownList1.SelectedValue = cid;
>            }
>        }
>    }
>
> Hope helps. Thanks,
>
> Steven Cheng
> Microsoft Online Support
>
> Get Secure! www.microsoft.com/security
> (This posting is provided "AS IS", with no warranties, and confers no
> rights.)
>
> --------------------
> | From: "Rickey Whitworth" <rickey@community.nospam>
> | Subject: Understanding query strings
> | Date: Wed, 7 Dec 2005 10:25:19 -0600
> | Lines: 17
> | X-Priority: 3
> | X-MSMail-Priority: Normal
> | X-Newsreader: Microsoft Outlook Express 6.00.2900.2527
> | X-RFC2646: Format=Flowed; Original
> | X-MimeOLE: Produced By Microsoft MimeOLE V6.00.2900.2527
> | Message-ID: <ev1nvr0#FHA.4***@tk2msftngp13.phx.gbl>
> | Newsgroups: microsoft.public.dotnet.framework.aspnet.webcontrols
> | NNTP-Posting-Host: 66.182.150.119
> | Path: TK2MSFTNGXA02.phx.gbl!TK2MSFTNGP08.phx.gbl!tk2msftngp13.phx.gbl
> | Xref: TK2MSFTNGXA02.phx.gbl
> microsoft.public.dotnet.framework.aspnet.webcontrols:31607
> | X-Tomcat-NG: microsoft.public.dotnet.framework.aspnet.webcontrols
> |
> | I have a page with two web controls - a drop-down list of server names
> and a
> | gridview that shows details about that server. The gridview is using the
> | drop down list as a parameter, so changing the selected server in the
> | drop-down list causes a postback and the gridview updates to the new
> server.
> |
> | What I would like to do is add the ability to pass a querystring to the
> page
> | similar to the following:
> |
> | http://somewhere.com/servers.aspx?server=server1
> |
> | so that when the page loads, server1 is pre-selected. I also want the
> | ability to change the server name once I get to the page if I need to.
> |
> | I thought about binding the gridview to the querystring, but I cannot
> figure
> | out how to make the querystring change on postback.
> |
> |
> |
>