Question

I have an asp dropbox which I populate from database:

this is the aspx

<asp:DropDownList runat="server" ID="ddl_last" AppendDataBoundItems="true">

and this is the cs:

  ddl_last.DataSource = eggsContext.Customers;
        ddl_last.DataValueField = "last_name";
        ddl_last.DataTextField = "last_name";
        ddl_last.DataBind();

When I try to get ddl_last.SelectedValue from the c# code I get nothing. infact ddl_last.Items count is 0! When I don’t populate it from code, but write in the aspx

<asp:ListItem Text="example" />

everything works.

I can get the value from javascript by writing
document.getElementById(‘ddl_last’).value;

But I was wondering what did microsoft screw up this time that this is not working from the code behind?

Answer 1

After seeing your issue in comment, I think this may help you resolve it:

To disable view state for a page and to enable it for a specific control on the page, set the EnableViewState property of the page and the control to true, set the ViewStateMode property of the page to Disabled, and set the ViewStateMode property of the control to Enabled.

http://msdn.microsoft.com/en-us/library/system.web.ui.control.viewstatemode.aspx

Note also, with ViewState being disabled, you can still retrieve the posted value by

if (Request["ddl_last"] != null)
    val = Request["ddl_last"];