modifying functionality of all textboxes in an application?

[RHankinsJr]

I have an application I wrote where the end users are requesting some additional functionality to every text box in the system.

I know how to do it on a form level or individual part level, but I was curious if there is a way to add it without adding code to each form.

I seem to recall someone once showing us here how to add to a class where it it modifies all objects of that class.

Can anyone point me in the right direction?

[4x2y]

Create your won text box by inheriting TextBox

Public Class MyTextBox
    Inherits System.Windows.Forms.TextBox
    
    ' add your new Methods, Properties and events
    
End Class

[dunfiddlin]

Public Class TextBoxMod
    Inherits TextBox
 
    'all your extra stuff
 
End Class

Now replace your textboxes with an instance of your class.

Dim txb As TextBoxMod = New TextBoxMod
        With txb
            .BorderStyle = BorderStyle.None
            .Enabled = True
            .Width = 150
            .Height = 20
            .Location = New Point(100, 100)
            .Visible = True
        End With
        Me.Controls.Add(txb)

[RHankinsJr]

Hmm, thanks. That's not exactly what I was talking about. Maybe I'm mistaken but the example I was talking about actually extended the textbox control itself. Now that I am typing this I remember it was an example showing how to extend all the text box controls to include a dirty variable. Now that I remember that I'll do some more searching and find it. Thank you all for your help.

[4x2y]

What is dirty variable mean?

[RHankinsJr]

The example was showing how to extend all text boxes in the system to have a boolean variable that told if the contents of the control have changed since it was populated with data. I will for some searching, I think it was in the codebank on here. Thanks again. I will do some searching once I get at an actual PC now that I remember what the example was about. Thanks again.