ASP:DropDownList in ItemTemplate: Why is SelectedValue attribute allowed?
- by recursive
This piece of code
<asp:DropDownList runat="server" ID="testdropdown" SelectedValue="2">
<asp:ListItem Text="1" Value="1"></asp:ListItem>
<asp:ListItem Text="2" Value="2"></asp:ListItem>
<asp:ListItem Text="3" Value="3"></asp:ListItem>
</asp:DropDownList>
yields this error:
The 'SelectedValue' property cannot be
set declaratively.
Yet, this is a legal and commonly used edit template for databound GridViews. The SelectedValue attribute certainly appears to be declaratively set here.
<EditItemTemplate>
<asp:DropDownList runat="server"
ID="GenreDropDownList"
DataSourceID="GenreDataSource"
DataValueField="GenreId"
DataTextField="Name"
SelectedValue='<%# Bind("Genre.GenreId") %>'>
</asp:DropDownList>
</EditItemTemplate>
The question is: what is the difference between the cases when you are allowed to set it declaratively and those in which you are not? The error message implies that it's never allowed.
