ASP.NET 3.5 / AJAX - ImageButton_Click is undefined


Having just deployed my first website in ASP.NET with use of the Ajax Library I have recently been informed of an error message in IE 7 where I am using an ASP:ImageButton (it works in Firefox and Chrome).

The error message is 'ImageButton1_Click' is undefined. There are probably about 6 or 7 ImageButtons in the whole project and each time I get the same error message but with a different object name.

Having tried ASP:Buttons and ASP:LinkButtons neither of these work too.

I have researched and googled as much as I possiblity can with no solutions. I hate to admit defeat so please can an expert help?

Many thanks in advance.

PS - The "code behind" the button is  
<form runat="server">
<asp:ImageButton ID="ImageButton1" runat="server" ImageUrl="~/images/design/button_green_confirm.png" OnClientClick="ImageButton1_Click" /></form>

Partial Class index
    Inherits System.Web.UI.Page

    Protected Sub ImageButton1_Click(ByVal sender As Object, ByVal e As System.Web.UI.ImageClickEventArgs) Handles ImageButton1.Click
        Dim strIsThisDoingMyNut As String
        strIsThisDoingMyNut = "Hell Yes!"
    End Sub
End Class

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You have OnClientClick="ImageButton1_Click"
so it is expecting a javascript method on Client side...

If you want to just use serverside method that you have above in your code then remove that part: OnClientClick="ImageButton1_Click" it is not necessary.

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David RobitailleAnalyst ProgrammerCommented:
or use OnClick="ImageButton1_Click" ...
advfinanceAuthor Commented:
And that's why they call you a genius!

Thanks buddy - I didn't even consider that ClientClick would mean a client side operation (may come in very handy someday). You learn something new ever day!

Cheers :o)
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advfinanceAuthor Commented:
--> or use OnClick="ImageButton1_Click" .

No that is not required "Handles ImageButton1.Click" should take care of that ....

Adding that might cause button click to fire twice ....depending on AutoEventWireup property...
David RobitailleAnalyst ProgrammerCommented:
guru_sami, you are right. it`s either a handle or a onClick, not both.
 I just wanted to mention that the property to use when you want to set a sub to handle the click event from the aspx code is OnClick, not onClientClick.
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