I'm trying to do some GUI stuff in a C# program. Basically I have a Combo Box where I select which database results I want to see. When I select an item in the Combo Box, it generates an event ...

In this case, the SelectedItem you set does not exist in the ItemsSource. You can resolve this issue through some design changes, such as subscribing to the ValueChanged event of ComboBox.ItemsSource ...

Add a description, image, and links to the datagridview-combobox topic page so that developers can more easily learn about it ...