Dim mouseOffset As Point
    Private Sub Form1_MouseDown(ByVal sender As Object, ByVal e As System.Windows.Forms.MouseEventArgs) Handles Me.MouseDown
        mouseOffset = New Point(-e.X, -e.Y)
    End Sub

    Private Sub Form1_MouseMove(ByVal sender As Object, ByVal e As System.Windows.Forms.MouseEventArgs) Handles Me.MouseMove
        If e.Button = Windows.Forms.MouseButtons.Left Then
            Dim mousePos As Point = Control.MousePosition
            mousePos.Offset(mouseOffset.X, mouseOffset.Y)
            Location = mousePos
        End If
    End Sub