Events for programatically added controls

29 Aug 2006 4:45 PM

John Austin

I am new to asp.net. I need to create a form programatically. I could use
Response.Write to create html input fields and the Request.Form collection,
but there is the Placeholder conbtrol that can be used to add controls on the
fly. However, I can't see how to respond to events raised by the dynamically
added controls. How can you hook up the events?

--
John Austin

30 Aug 2006 7:37 AM

Walter Wang [MSFT]

Hi John,

You can add the control in Page_Load, for example:

    protected void Page_Load(object sender, EventArgs e)
    {
        Button btn = new Button();
        btn.ID = "newButton1";
        btn.Text = "New Button";
        btn.Click += new EventHandler(btn_Click);
        PlaceHolder1.Controls.Add(btn);
    }

    void btn_Click(object sender, EventArgs e)
    {
        Response.Write("clicked from new button");
    }

Hope this helps. Please feel free to post here if anything is unclear.

Sincerely,
Walter Wang (waw***@online.microsoft.com, remove 'online.')
Microsoft Online Community Support

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30 Aug 2006 11:08 AM

John Austin

I guess this should be obvious, but how do you code
btn.Click += new EventHandler(btn_Click);
in VB?

AddHandler btn.Click, AddressOf btn_Click

underlines the btn.Click as an error

Thanks

--
John Austin

Show quoteHide quote

"Walter Wang [MSFT]" wrote:

> Hi John,
>
> You can add the control in Page_Load, for example:
>
>     protected void Page_Load(object sender, EventArgs e)
>     {
>         Button btn = new Button();
>         btn.ID = "newButton1";
>         btn.Text = "New Button";
>         btn.Click += new EventHandler(btn_Click);
>         PlaceHolder1.Controls.Add(btn);
>     }
>
>     void btn_Click(object sender, EventArgs e)
>     {
>         Response.Write("clicked from new button");
>     }
>
> Hope this helps. Please feel free to post here if anything is unclear.
>
> Sincerely,
> Walter Wang (waw***@online.microsoft.com, remove 'online.')
> Microsoft Online Community Support
>
> ==================================================
> Get notification to my posts through email? Please refer to
> http://msdn.microsoft.com/subscriptions/managednewsgroups/default.aspx#notif
> ications.
>
> Note: The MSDN Managed Newsgroup support offering is for non-urgent issues
> where an initial response from the community or a Microsoft Support
> Engineer within 1 business day is acceptable. Please note that each follow
> up response may take approximately 2 business days as the support
> professional working with you may need further investigation to reach the
> most efficient resolution. The offering is not appropriate for situations
> that require urgent, real-time or phone-based interactions or complex
> project analysis and dump analysis issues. Issues of this nature are best
> handled working with a dedicated Microsoft Support Engineer by contacting
> Microsoft Customer Support Services (CSS) at
> http://msdn.microsoft.com/subscriptions/support/default.aspx.
> ==================================================
>
> This posting is provided "AS IS" with no warranties, and confers no rights.
>
>

30 Aug 2006 11:35 AM

John Austin

Sorry Walter, I had a typo in the program, it works fine.
I had
Dim btn = New Button()
instead of
Dim btn as New Button()
(it got left from the C#)

--
John Austin

Show quoteHide quote

"Walter Wang [MSFT]" wrote:

> Hi John,
>
> You can add the control in Page_Load, for example:
>
>     protected void Page_Load(object sender, EventArgs e)
>     {
>         Button btn = new Button();
>         btn.ID = "newButton1";
>         btn.Text = "New Button";
>         btn.Click += new EventHandler(btn_Click);
>         PlaceHolder1.Controls.Add(btn);
>     }
>
>     void btn_Click(object sender, EventArgs e)
>     {
>         Response.Write("clicked from new button");
>     }
>
> Hope this helps. Please feel free to post here if anything is unclear.
>
> Sincerely,
> Walter Wang (waw***@online.microsoft.com, remove 'online.')
> Microsoft Online Community Support
>
> ==================================================
> Get notification to my posts through email? Please refer to
> http://msdn.microsoft.com/subscriptions/managednewsgroups/default.aspx#notif
> ications.
>
> Note: The MSDN Managed Newsgroup support offering is for non-urgent issues
> where an initial response from the community or a Microsoft Support
> Engineer within 1 business day is acceptable. Please note that each follow
> up response may take approximately 2 business days as the support
> professional working with you may need further investigation to reach the
> most efficient resolution. The offering is not appropriate for situations
> that require urgent, real-time or phone-based interactions or complex
> project analysis and dump analysis issues. Issues of this nature are best
> handled working with a dedicated Microsoft Support Engineer by contacting
> Microsoft Customer Support Services (CSS) at
> http://msdn.microsoft.com/subscriptions/support/default.aspx.
> ==================================================
>
> This posting is provided "AS IS" with no warranties, and confers no rights.
>
>