Visual Basic

Dim foundTextBox As TextBox = FindTextBox("AX")
If Not foundTextBox Is Nothing Then
    foundTextBox.Text = myValue
End If
 
.
 
Private Function FindTextBox(ByVal textboxName As String) As TextBox
    Dim currControl As Control
    For Each currControl In Me.Controls
        If GetType(currControl).Equals(GetType(TextBox)) Then
            ' Found a TextBox, now check its Name property
            If String.Compare(currControl.Name, textboxName, True) = 0 Then
                ' Found the correct TextBox, return this instance of the control
                Return currControl
            End If
        End If
    Next
    Return Nothing
End Function