[GT08]

Originally Posted by FordGT90Concept

And let me give you a tip to cut down on the repetitiveness of your code. You can write a sub like this to perform all those checks:

Private Function Validate(ByRef obj As TextBox) As Double
  If (obj.Text.Length > 0) Then
    Dim value As Double = Convert.ToDouble(obj.Text)
    If (value.Text  > 10) Then
      obj.BackColor = Color.Pink
      MsgBox("Value must be between 1 and 10.")
    Else
      obj.BackColor = Color.White
      Return value
    End If
  End If
End Function

Then to validate a control, you'd just have to do the following:

Validate(txtbox1)

You can play with that concept to make it how you like it. It cuts way down on the repetition.

Where would I put this code? Would it be in my form load or my txtbox1 or in my button (process order)?

As it says " 'Return' Statement in a sub or a set cannot return a value"