Check out example codes for "vb.net center form in screen". It will help you in understanding the concepts better.

Code Example 1

Public Shared Sub CenterForm(ByVal frm As Form, Optional ByVal parent As Form = Nothing)
    '' Note: call this from frm's Load event!
    Dim r As Rectangle
    If parent IsNot Nothing Then
        r = parent.RectangleToScreen(parent.ClientRectangle)
    Else
        r = Screen.FromPoint(frm.Location).WorkingArea
    End If

    Dim x = r.Left + (r.Width - frm.Width) \ 2
    Dim y = r.Top + (r.Height - frm.Height) \ 2
    frm.Location = New Point(x, y)
End Sub

Code Example 2

Private Sub Button1_Click(sender As System.Object, e As System.EventArgs) Handles Button1.Click
    Me.Size = New System.Drawing.Size(400, 650)
    Me.CenterToScreen()
End Sub

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