How to specify path using open file dialog in vb.net?

Dim filedialog As New OpenFileDialog
filedialog.IntialDirectory = Application.StartupPath
filedialog.ShowDialog()

If I understand correctly, you want to let the user choose a folder. If that is the case, then you want to use FolderBrowserDialog instead of OpenFileDialog.

You want to use the FolderBrowserDialog class instead of the OpenFileDialog class. You can find more information about it here:

http://msdn.microsoft.com/en-us/library/system.windows.forms.folderbrowserdialog(v=vs.110).aspx

For instance, you could do this:

If apppath = "" Then
    Dim dialog As New FolderBrowserDialog()
    dialog.RootFolder = Environment.SpecialFolder.Desktop
    dialog.SelectedPath = "C:\"
    dialog.Description = "Select Application Configeration Files Path"
    If dialog.ShowDialog() = Windows.Forms.DialogResult.OK Then
        apppath = dialog.SelectedPath
    End If
    My.Computer.FileSystem.WriteAllText(apppath & "apppath.txt", apppath, False)
End If