Question : How to refer to individual characters in a textbox

How can I refer to individual characters in a textbox on an Access form?  For example, let's say I have a textbox that allows 4 characters/numbers to be entered into it. I want to be able to do something like check whether the second byte in the textbox (from left to right) is a character or a number.

Example:
Textbox has this value in it:       1A34
I want to be able to check if the second byte is a letter or number. In the example above, it would be a letter (A).  I don't need to do anything more than check if they are letters or numbers but I need to be able to do it on the individual byte level. I don't know how to refer to individual bytes/characters in a textbox. Thanks.

Answer : How to refer to individual characters in a textbox

2 -Typos ... assuming your text box has a Name of Text1

Private Sub Text1_Change()

     If IsNumeric(Mid(Me.Text1.Text , 2, 1) ) Then
        ' Numeric
     Else
        ' alpha
     End If


End Sub