[Solved] Avoiding InvalidCastException in a custom edit form?

[Chris]

I've put together a custom popup edit form using a template, and I'm having a problem with some checkboxes on it.  I have them declared in the template like so:

<asp:CheckBox ID="chkWriter" runat="server" Text="Writer" Checked='<%# Bind("Writer") %>'/>

This works fine when I'm editing a record, but when I go to insert a new one I get an InvalidCastException here.

[Princy]

Hello Chris,

The reason for this error is that your grid instance cannot bind a value for the newly inserted item through the Eval()/Bind() syntax you hard-coded. This can be fixed by presetting the default value of the control(s) when binding to a grid item on the RadGrid.InitInsertCommandName command as shown below:
c#:

protected void RadGrid1_ItemCommand(object source, Telerik.Web.UI.GridCommandEventArgs e)
     {
    if ((e.CommandName == RadGrid.InitInsertCommandName))
           {
        e.Canceled = true;
        //Prepare an IDictionary with the predefined values
        System.Collections.Specialized.ListDictionary newValues = new System.Collections.Specialized.ListDictionary();

        //set initial checked state for the checkbox on init insert
        newValues("Writer") = false;

        //Insert the item and rebind
        e.Item.OwnerTableView.InsertItem(newValues);
    }
}

Thanks
Princy.