I have a button which is in update panel. When I click on button then it click event run two times. How can I prevent second time click event?
Check if you did not attach the handler function twice to the click event (for example once by html/javascript and once in the vb code).
I had the same problem.
I had an "onclick=swap_img" in the aspx code and the following in the vb code so it ran twice. I just removed the onclick in the aspx code:
Protected Sub swap_img(sender As Object, e As System.Web.UI.ImageClickEventArgs) Handles btn_img.Click
This article helped me figure this problem out: http://forums.asp.net/t/1056418.aspx
Why not disable the button at the start of the button callback function...
Then, using something sensible like a try/finally block, enable the button at the end, in the finally.
On Page load, you can use:
button.Attributes.Add("onClick", "<< javascript >>")
... to attach some javascript to the Click event of the button.
You can find javascript to disable the button with a simple Google search.
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