Make sure one input is always bigger than the other

[ilvbvm]

Hi

Please help me with this code

I would like to know how to make my l(length) always bigger than w(width).
eg: message box "Make Length bigger than width" and the 2 inputs, and 3 outputs = [blank]

Public Class Form1
Dim min, max As Integer
Private Sub Button1_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles Button1.Click
Dim l, w, tl, r, x, rr As Integer

Call numbercheck(TextBox1.Text, 1, 30)
If numbercheck(TextBox1.Text, 1, 30) = True Then
l = TextBox1.Text
Else : MsgBox("Enter a number between 1 and 30 in the Length box") : TextBox1.Text = ""
End If

Call numbercheck(TextBox2.Text, 1, 20)
If numbercheck(TextBox2.Text, 1, 20) = True Then
w = TextBox2.Text
Else : MsgBox("Enter a number between 1 and 20 in the Width box") : TextBox2.Text = ""
End If

If w > l Then MsgBox("Make Length greater than Width") : TextBox1.Text = "" : TextBox2.Text = ""





'rolls'
r = (w / 5)
rr = Math.Ceiling(w / 5)
TextBox4.Text = r


'total length'
tl = (r * l)
TextBox3.Text = tl

'excess carpet'
x = (rr * 30) - tl
TextBox5.Text = x

TextBox3.Text = tl
TextBox4.Text = r
TextBox5.Text = x


End Sub
Function numbercheck(ByVal value, ByVal min, ByVal max)
If IsNumeric(value) = True Then
numbercheck = True
If value > max Then numbercheck = False
If value < min Then numbercheck = False
Else : numbercheck = False
End If

End Function

Private Sub ClearButton_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles ClearButton.Click
TextBox1.Text = ""
TextBox2.Text = ""
TextBox3.Text = ""
TextBox4.Text = ""
TextBox5.Text = ""
End Sub
End Class