I'm using the WebDropDown and posting back with OnSelectionChanged. When it posts back I try to access the SelectedValue property but it has no value. In my debugger the value shows as "{"Object reference not set to an instance of an object."}". Why would this not have the value of the item I selected from the drop down? Code below...
<asp:ScriptManager ID="ScriptManager1" EnablePartialRendering="True" runat="server" />
<asp:UpdatePanel ID="UpdatePanel1" runat="server">
<ContentTemplate>
<ig:WebDropDown ID="wdd_AddAgent" Width="250px" OnPreRender="ClientFiltering_PreRender" EnableAutoCompleteFirstMatch="false" DropDownContainerHeight="300px" EnableViewState="false" EnableAutoFiltering="Client" OnSelectionChanged="Populate_Default_Commission" AutoPostBackFlags-SelectionChanged="Async" runat="server"> </ig:WebDropDown>
<br /><br />
<asp:Button ID="btn_AddAgent" runat="server" Text="Add Agent" />
</ContentTemplate>
</asp:UpdatePanel>
Protected Sub Populate_Default_Commission(ByVal sender As Object, ByVal e As System.EventArgs)
If Not wdd_AddAgent.SelectedValue Is Nothing Then
End If
End Sub
Also, here's how I'm populating the items in the drop-down:
wdd_AddAgent.DataSource = DataSet1.Tables(0)wdd_AddAgent.ValueField = "agent_id"wdd_AddAgent.TextField = "agent_name"
When I post back with OnSelectionChanged and look at the properties of theWebDropDown, the CurrentValue property has the value of the "agent_name" value for the item I selected. Shouldn't CurrentValue have the value of the "agent_id" that I defined for the ValueField?
I found the problem. I needed to set EnableViewState to True.