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 which I ...

And you have some lists that contains all Categories, Products and OrderItems. And you want to show order items in grid and let the user select category and product from combo boxes. When the user ...

Take a moment to peruse the WinForms DataGrid - Column Sizing documentation, where you can find about Column Sizing with code examples.