If you’re using the TabContainer, which is part of the Ajax Control Toolkit and have noticed that when you remove a tab you have issues accessing the values from a DropDownList using .SelectedItem.Value or .SelectedValue then below is the solution:

Instead of using the below to remove a tab:

Use this code to remove the tab instead:

As you can see, you need to state the index rather than the id, but just remember that indexes start at 0.

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