Forms Data Controls :: Unique Values In Dropdown List At Runtime?

Oct 4, 2010

In given code finally I want to populate unique values at runtime in 2 drop downlist.

protected void Page_Load(object sender, EventArgs e)
{
vidDocument.Load(Server.MapPath("~/CurrentStatus.xml"));
HttpContext.Current.Response.Cache.SetCacheability(HttpCacheability.NoCache);
Response.ExpiresAbsolute = DateTime.Now.AddMonths(-1);

[Code]....

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[Code]....

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[code]...

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[Code]....

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[Code]....

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[Code]....

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'PictureReadOnlyCategories' has a SelectedValue which is invalid because it does not exist in the list of items. Parameter name: value 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.ArgumentOutOfRangeException: 'PictureReadOnlyCategories' has a SelectedValue which is invalid because it does not exist in the list of items. Parameter name: value

The code for this is :

<asp:SqlDataSource ID="categoriesDataSource" runat="server"
ConnectionString="<%$ ConnectionStrings:ConnectionString %>"
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<SelectParameters>

[Code]....

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I will try to keep the question short:

1. I am new to ASP and I can not get this to work:

2. I am Using a <asp:DropDownList in a <InsertItemTemplate> in a <asp:ListView

3. The dropdownlist during insert does not get polulated (it is empty) while the same construction and same datasource works in the edittemplate: <asp:DropDownList in a <EditTemplate> in a <asp:ListView

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