How to have open dialog with only vb.net sln files

Here is a good example
http://msdn.microsoft.com/en-us/library/system.windows.forms.filedialog.filter.aspx

Specificially you need:

        Dim openFileDialog1 As New OpenFileDialog()

        openFileDialog1.InitialDirectory = "c:\"
        openFileDialog1.Filter = "Solution files (*.sln)|*.txt|All files (*.*)|*.*"

        dim result as System.Windows.Forms.DialogResult
        result = openFileDialog1.ShowDialog

Cheers mate