For simplicity sake,

How do you get the value of selected dropdown on a postback?  I understand 
for a dynamic control, you need to re-create it on each postback, but how do 
I modify the code to grab the SelectedValue?  

protected void Page_Load(object sender, EventArgs e)
{
        DropDownList list = new DropDownList();
        list.ID = "DropDownList1";
        list.Items.Add(new ListItem("1", "One"));
        list.Items.Add(new ListItem("2", "Two"));
        list.Items.Add(new ListItem("3", "Three"));
        PlaceHolder1.Controls.Add(list);      
}

Hi,
So, the controls that were dynamically created are no longer there and 
consequently the values returned from these controls have no place to go. 
They are lost in the viewstate. 

In order to catch these values the dynamically generated controls needs to 
be re-generated at Page_Load. The important thing is to assign the same ID to 
each control. The ViewState uses the ID property of the Control objects to 
reinstate the values. 

If you create a dynamic dropdownlist, conditionally, say in response to some 
other control's click event. Then, on PostBack, you recreate a "new" dropdown 
with the same object name, then "magically" that new dropdown becomes the 
dynamically-created dropdown. You get all of the user-initiated and 
code-generated properties.
ref:http://www.codeproject.com/aspnet/retainingstate.asp?df=100&forumid=14609&exp=0&select=1495875
-- 
Hope this answers your question.
Thanks and Regards.
Manish Bafna.
MCP and MCTS.



"Dave" wrote:


> For simplicity sake,
> 
> How do you get the value of selected dropdown on a postback?  I understand 
> for a dynamic control, you need to re-create it on each postback, but how do 
> I modify the code to grab the SelectedValue?  
> 
> protected void Page_Load(object sender, EventArgs e)
> {
>         DropDownList list = new DropDownList();
>         list.ID = "DropDownList1";
>         list.Items.Add(new ListItem("1", "One"));
>         list.Items.Add(new ListItem("2", "Two"));
>         list.Items.Add(new ListItem("3", "Three"));
>         PlaceHolder1.Controls.Add(list);      
> }
>               

Place the code for control creting in the PreInit event. The reason is
because LoadViewState occurs between Init and Load events.

-- 
Eliyahu Goldin,
Software Developer & Consultant
Microsoft MVP [ASP.NET]
http://msmvps.com/blogs/egoldin


"Dave"  wrote in message
news:462AB8FC-3F2A-40CF-9920-119F5A6C9224@microsoft.com...

> For simplicity sake,
>
> How do you get the value of selected dropdown on a postback?  I understand
> for a dynamic control, you need to re-create it on each postback, but how
do
> I modify the code to grab the SelectedValue?
>
> protected void Page_Load(object sender, EventArgs e)
> {
>         DropDownList list = new DropDownList();
>         list.ID = "DropDownList1";
>         list.Items.Add(new ListItem("1", "One"));
>         list.Items.Add(new ListItem("2", "Two"));
>         list.Items.Add(new ListItem("3", "Three"));
>         PlaceHolder1.Controls.Add(list);
> }
>