Create a VS 2005 Debugging Visualizer

Visual Studio 2005 visualizers allow you to see the data contained in a variable.  For this example we will create a visualizer to see the value of a guid.  To create a visualizer we need to start with a class library project.  Add a reference to Microsoft.VisualStudio.DebuggerVisualizers and System.Windows.Forms.  Set the build output path in the compile tab of my project to My Documents\Visual Studio 2005\Visualizers. 

Imports Microsoft.VisualStudio.DebuggerVisualizers
Imports System.Windows.Forms

<Assembly: DebuggerVisualizer(GetType(GuidVisualizer), target:=GetType(Guid), description:="Guid visualizer")>
Public Class GuidVisualizer
    Inherits DialogDebuggerVisualizer

    Protected Overrides Sub Show(ByVal windowService As Microsoft.VisualStudio.DebuggerVisualizers.IDialogVisualizerService, ByVal objectProvider As Microsoft.VisualStudio.DebuggerVisualizers.IVisualizerObjectProvider)
        Dim g As Guid = CType(objectProvider.GetObject, Guid)
        MessageBox.Show(g.ToString)
    End Sub

End Class