I have checked the variable txtRoomType and there is a value associated to it. Can you give me a greater explination of the error as I am having trouble understanding what MSDN is trying to explain.

What is still confusing me is that the problem only occurs once a new datarow has been added to the grid. At all other times (ie editing, deleting and scrolling through the combobox), it behaves as it should.

Computerman