Insert records with IBindableTemplate causes error

[Michael Malone]

I can update just fine in a custom templated form but when I click the "Add new record" button that is generated by the RadGrid, I get an exception in my "InstantiateIn" method of "Index was out of range. Must be non-negative and less than the size of the collection. Parameter name: index". I'm guessing I have to check whether the grid is performing an insert vs and update, but I'm not sure how to do this. 

public void InstantiateIn(System.Web.UI.Control container)
{
            //This throws exception
            GridEditFormItem item = ((GridEditFormItem)(container.NamingContainer));

}

[Pavlina]

Hello Michael,

You can try check the NamingContainer of current control whether it is in edit or insert mode.

For example:

public void InstantiateIn(Control container)
    {
        GridItem item = (GridItem)container.NamingContainer;
        if (item is GridEditFormInsertItem)
        {
            //insert mode
        }
        else if (item is GridEditFormItem && item.IsInEditMode)
        {
            //edit mode
        }
    }

Give it a try and let me know about the result.

Sincerely yours,
Pavlina
the Telerik team

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[Michael Malone]

That works great, thanks.... In the meantime I had found a solution by checking Item.ItemIndex. Is there any potential issue by doing it this way?

GridEditFormItem item = ((GridEditFormItem)(container.NamingContainer))

if (item.ItemIndex >= 0)
{
   //Edit
}
else
{
   //Insert
}