Add an uninstall start menu item to your .NET deployment project

string[] ss = arg.Split("=".ToCharArray(), StringSplitOptions.RemoveEmptyEntries);
if (ss[0].ToLower() == "/u" && ss.Length == 2)
{
        if (MessageBox.Show("Whatever question you want?", "Whatever caption you want", MessageBoxButtons.YesNo, MessageBoxIcon.Question) == DialogResult.Yes)
        {
                string guid = ss[1];
                string path = Environment.GetFolderPath(Environment.SpecialFolder.System);
                ProcessStartInfo si = new ProcessStartInfo(path + "\\msiexec.exe", "/x " + guid + " /qb");
                Process.Start(si);
        }
        Application.Exit();
        return;
}

Sub New() 'i wrote this sub

     Dim arguments As String() = Environment.GetCommandLineArgs()
     Dim argument As String
     For Each argument In arguments
         If argument.Split("=")(0).ToLower = "/u" Then
             Dim guid As String = argument.Split("=")(1)
             Dim path As String = _
                Environment.GetFolderPath(Environment.SpecialFolder.System)
             Dim si As New ProcessStartInfo(path & _
                       " C:\Program Files\BSE 2008\Database\msiexec.exe", "/i " & guid)
             Process.Start(si)
             Close()
             Application.Exit()
             End
         End If
     Next

     ' This call is required by the Windows Form Designer.
     InitializeComponent()

     ' Add any initialization after the InitializeComponent() call.

 End Sub

 'NOTE: The following procedure is required by the Windows Form Designer
 'It can be modified using the Windows Form Designer.
 'Do not modify it using the code editor.
 <system.diagnostics.debuggerstepthrough()> _
 Private Sub InitializeComponent()
    ......
 End Sub

Dim si As New ProcessStartInfo(path & _
    "\msiexec.exe", "/i " & guid)

Dim si As New ProcessStartInfo( _
    path & "\msiexec.exe", "/i " & guid)