Question

I plan to add functionalities to TextBox with the following:

   public class TextBoxExt : TextBox  
    {
        protected override void OnKeyPress(KeyPressEventArgs e)
        {
            base.OnKeyPress(e);
        }

    }

The question is how can we use this TextBoxExt? Is there anyway to get this class onto the ToolBox so that we can just drag and drop it onto the form? If not, what is the best way to use the TextBoxExt?

Answer 1

I believe there are a couple of ways to get your control to appear in the toolbox:

1. The project it’s in must be included in your open solution and the project must have been compiled/built into an assembly. This is the route to go if you’re working on the control and a project that uses the control at the same time (e.g., building the solution will also re-build the control’s project).

2. You can right-click the toolbox to add new items… in the resulting dialog, you can browse to the assembly containing the control and add it that way (or add it to the GAC, in which case you can pick it right from the list without browsing). This is the route to go if the project containing your control won’t be a part of your solution and you’re dealing only with the compiled DLL (e.g., building the solution doesn’t re-build the control’s project).