How do I display trace and debug information?

Although you can display trace and debug information directly in a MessageBox, it's usually best to display it in Visual Studio's Output window by means of the Trace or Debug classes.

For example, in C#:

using System.Diagnostics;

Debug.WriteLine("My first string");
Trace.WriteLine("My second string");

And in Visual Basic .NET:

Import System.Diagnostics;

Debug.WriteLine("My first string")
Trace.WriteLine("My second string")