Forms Data Controls :: Two Listboxes In A GridView Control?
Jan 12, 2010
I have two drop down listboxes in a GridView control. I want to populate the second drop down listbox based upon the value that was selected in the first drop down listbox. Currently I have not been able to populate the second drop down listbox. I am attempting to do this in the C# code file. See line 26 below.
// Here is some of my Aspx code:
this first item template populates the first drop down listbox:
<ItemTemplate>
<asp:DropDownList ID="ddlFirstDropDown" runat="server"
DataSourceID="SqlDataSourceBodyBuild"
DataTextField="BodyPart" DataValueField="EmployeeId" AppendDataBoundItems="True"
Width="110px" AutoPostBack="True"
onselectedindexchanged="ddlFirstDropDown_SelectedIndexChanged">
[Code]...
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[Code]....
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[Code]....
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Server Error in '/' Application.
Failed to load viewstate. The control tree into which viewstate is being loaded must match the control tree that was used to save viewstate during the previous request. For example, when adding controls dynamically, the controls added during a post-back must match the type and position of the controls added during the initial request.
Description: An unhandled exception occurred during the execution of the current web request. Please review the stack trace for more information about the error and where it originated in the code.
Exception Details: System.Web.HttpException: Failed to load viewstate. The control tree into which viewstate is being loaded must match the control tree that was used to save viewstate during the previous request. For example, when adding controls dynamically, the controls added during a post-back must match the type and position of the controls added during the initial request.
Source Error:
[Code]....
Stack Trace:
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[Code]....
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