"Wen Ou" wrote:

> hi
>
> i got a problem about dropdownlist. i set autopostback true. when its index
> changed, i would like to get its value before changed and compare with the
> value after changed. i don't have any idear about that.
>
> anyone can help me
>
> thank you
>
> wen ou
>
>

"Michael Baltic" wrote:

> Create a new control and inherit from the dropdownlist.  Add a property for
> the previous value.
>
> When the dropdownlist is filled with items, set the previos value to null. 
> All other times, just put the current value into the previous value AFTER you
> read the contents of the previous value.
>
> Make sure the value is persisted in state.
> --
> Staff Consultant II - Enterprise Web Services - Cardinal Solutions Group
>
> Future Business Model - National City Mortgage
>
>
> "Wen Ou" wrote:
>
> > hi
> >
> > i got a problem about dropdownlist. i set autopostback true. when its index
> > changed, i would like to get its value before changed and compare with the
> > value after changed. i don't have any idear about that.
> >
> > anyone can help me
> >
> > thank you
> >
> > wen ou
> >
> >

"Wen Ou" wrote:

> Hi Michael
> thank you for your respondance
> i still don't understand your answer. could you give me more details please
>
> thank you
> wen ou
>
> "Michael Baltic" wrote:
>
> > Create a new control and inherit from the dropdownlist.  Add a property for
> > the previous value.
> >
> > When the dropdownlist is filled with items, set the previos value to null. 
> > All other times, just put the current value into the previous value AFTER you
> > read the contents of the previous value.
> >
> > Make sure the value is persisted in state.
> > --
> > Staff Consultant II - Enterprise Web Services - Cardinal Solutions Group
> >
> > Future Business Model - National City Mortgage
> >
> >
> > "Wen Ou" wrote:
> >
> > > hi
> > >
> > > i got a problem about dropdownlist. i set autopostback true. when its index
> > > changed, i would like to get its value before changed and compare with the
> > > value after changed. i don't have any idear about that.
> > >
> > > anyone can help me
> > >
> > > thank you
> > >
> > > wen ou
> > >
> > >

"Michael Baltic" wrote:

> Do you know how to create an inherited control?  If not, I can give you some
> sample code.
>
> My email user id is Michael.Baltic the domain is NCMC.com (That should stop
> an automated spammer?)
>
> If you don't want to create an inherited control, you can use session
> variables to save the value.  Each time you read the current value, save it
> to the previous value (after you read the contents of the previous value)
> --
> Staff Consultant II - Enterprise Web Services - Cardinal Solutions Group
>
> Future Business Model - National City Mortgage
>
>
> "Wen Ou" wrote:
>
> > Hi Michael
> > thank you for your respondance
> > i still don't understand your answer. could you give me more details please
> >
> > thank you
> > wen ou
> >
> > "Michael Baltic" wrote:
> >
> > > Create a new control and inherit from the dropdownlist.  Add a property for
> > > the previous value.
> > >
> > > When the dropdownlist is filled with items, set the previos value to null. 
> > > All other times, just put the current value into the previous value AFTER you
> > > read the contents of the previous value.
> > >
> > > Make sure the value is persisted in state.
> > > --
> > > Staff Consultant II - Enterprise Web Services - Cardinal Solutions Group
> > >
> > > Future Business Model - National City Mortgage
> > >
> > >
> > > "Wen Ou" wrote:
> > >
> > > > hi
> > > >
> > > > i got a problem about dropdownlist. i set autopostback true. when its index
> > > > changed, i would like to get its value before changed and compare with the
> > > > value after changed. i don't have any idear about that.
> > > >
> > > > anyone can help me
> > > >
> > > > thank you
> > > >
> > > > wen ou
> > > >
> > > >