Object must implement IConvertible C#

I did a simple thing when I got this error. I bound a FormView control to SQLDataSource. The SQLDataSource was accepting a parameter from GridView in turn. The code was straightforward but I got this error.

Found out the problem was in here

<asp:ControlParameter ControlID="GridView1" Name="UserID" PropertyName="SelectedValue" Type="String" />

The designer had added Type=”String”. You just have to remove it and the error will go away. So it should look like this

            <asp:ControlParameter ControlID="GridView1" Name="UserID" PropertyName="SelectedValue" />

 

Object must implement IConvertible.

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