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AddHandler not working.

Posted on 2004-05-01
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Last Modified: 2008-10-03
Can anyone tell me why the code below is not working. When the button is clicked control does not seem to pass to the SubmitBtn_Click routine. Thanks.

Dim SubmitBtn as Button
SubmitBtn = New Button
SubmitBtn.Text = "OK"
SubmitBtn.Id = "OKButton"
AddHandler SubmitBtn.Click, AddressOf SubmitBtn_Click
Panel1.Controls.Add(SubmitBtn)
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Question by:DColin
5 Comments
 
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Accepted Solution

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CouldNotFindAnyOtherUsername earned 2000 total points
ID: 10967053
Hi DColin,
     What I can guess from this post and your last post regarding this problem is that the Click Event works when the page loads for the first time, but after a postback is made to the page, the click event stops working for the said button... Am i Right.. If this be the problem here's the solution:

Dynamically generated buttons should be generated in the Page_Load Function, so that after a postback, they are re-generated and the event handler re-associated.


Try changing your code as follows:

Private Sub Page_Load(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles MyBase.Load
     ' Don't put Page.IsPostBack check here
     GenerateButton

     If not IsPostBack then
         'Your other code goes here
     End
End Sub

Private Sub GenerateButton()
     Dim SubmitBtn as Button
     SubmitBtn = New Button
     SubmitBtn.Text = "OK"
     SubmitBtn.Id = "OKButton"
     AddHandler SubmitBtn.Click, AddressOf SubmitBtn_Click
     Panel1.Controls.Add(SubmitBtn)
End Sub
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LVL 1

Expert Comment

by:CouldNotFindAnyOtherUsername
ID: 10967077
If you want something detailed regarding dynamic control creation, visit the following link:

http://devcenter.infragistics.com/Articles/ArticleTemplate.ASPX?ArticleID=2149
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LVL 21

Expert Comment

by:tovvenki
ID: 10967344
Hi,

try this modified code
Dim SubmitBtn as new Button
SubmitBtn.Text = "OK"
SubmitBtn.Id = "OKButton"
AddHandler SubmitBtn.Click, AddressOf SubmitBtn_Click
Panel1.Controls.Add(SubmitBtn)

it should now work.

hope that this helps you.

regards,
venki
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Author Comment

by:DColin
ID: 10967463
CouldNotFindAnyOtherUsername

Taking into account my previous questions is what I call a truly holistic service. Your solution has got me one step closer to my goals. No doubt I will be back tomorrow with another question.
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