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Vb.net Textbox Command Button

Posted on 2004-11-24
Medium Priority
Last Modified: 2012-08-14
Windows form
I hve a windows form with 2 TextBoxes and 2 Cancel buttons. As a textboxes value can be cancelled .

I populate the data from the dataset (well i dont bind it as its not ncesssary)
in both the textboxes.  User can click cancel to cancel a value in textbox  where I update the database saying that line has been cancelled.
How would we know that if cancel button pressed corresponds to textbox1 or textbox2

Textbox1              cancelButton
Textbox2              cancelButton
Textbox3              cancelButton

Can a simple example be shown ? thanks in advance
Question by:sainavya1215
LVL 19

Accepted Solution

arif_eqbal earned 1200 total points
ID: 12672675
You surely will have different names for the three Cancel Buttons
Say ButtonCancel_1, ButtonCancel_2 and so on

Solution 1:

Handle the Click events of the Cancel Buttons separately

so ButtonCancel_1 Click means textBox1 value was cancelled
 ButtonCancel_2 Click means textBox2 value was cancelled

Solution 2:

use a common Event handler for Click of all such cancel Buttons
Then use

CType(sender, Button).Name to identify the name of the Cancel Button that was clicked


Author Comment

ID: 12676426
yep....Undestood solution 1 ..........could it be more explained on solution 2.... Thanks for that
LVL 14

Expert Comment

ID: 12677226
When an event handler is fired, it is passed an Object called "sender". This is the object that triggered the event.

If you know what type of object it is, you can use the CTYPE function to cast the generic Object into the object that triggered the event.

Solution 2 provided by arif_egbal simply says this:

Private Sub ButtonClicks(sender As Object, e as EventArgs) Handles Button1.Click, Button2.Click, Button3.Click
    Select Case CType(sender, Button).Name     ' This determines WHAT button the user clicked.
        Case "Button1"

        Case "Button2"

        Case "Button3"

End Sub

This technique allows you to reduce code by using the same event handler to handle multiple events from objects on your form.

Hope that helps.


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