Question

VB 2008.

I have several text boxes on a form and I want each of them to use the same event handler. I know how to manually wire each one up to the handler, but I’m looking for a more generic way so if I add more text boxes they will automatically be hooked up to the event handler.

Ideas?

EDIT: Using the C# sample from MusiGenesis (and with the help of the comment left by nick), I wrote this VB code:

Private Sub AssociateTextboxEventHandler()   For Each c As Control In Me.Controls     If TypeOf c Is TextBox Then       AddHandler c.TextChanged, AddressOf tb_TextChanged     End If   Next End Sub 

Thanks a lot! SO is great.

Answer 1

Do something like this in your form’s load event (C#, sorry, but it’s easy to translate):

private void Form1_Load(object sender, EventArgs e) {     foreach (Control ctrl in this.Controls)     {         if (ctrl is TextBox)         {             TextBox tb = (TextBox)ctrl;             tb.TextChanged += new EventHandler(tb_TextChanged);         }     }  }  void tb_TextChanged(object sender, EventArgs e) {     TextBox tb = (TextBox)sender;     tb.Tag = 'CHANGED'; // or whatever } 

It’s not properly recursive (it won’t find text boxes on panels, for example), but you get the idea.