Private Sub Form1_Load(ByVal sender As System.Object, ByVal e As _
      System.EventArgs) Handles MyBase.Load
        TextBox1.Text = "C:\"
    End Sub
 
    Private Sub Button1_Click(ByVal sender As System.Object, ByVal e As _
      System.EventArgs) Handles Button1.Click
        Dim fso As New Scripting.FileSystemObject()
 
        TextBox2.Text = fso.GetFolder(TextBox1.Text).Size
    End Sub