Normally when we add Javascript Alert to our asp.net it will be like this:
Page. ClientScript.RegisterStartupScript(this.GetType(), "winPop", "alert('Update is successful')
but this code is not working if you using the code inside update panel.
So in order to add javascript in update panel you need to register you client script to your script manager as shown below:
ScriptManager.RegisterClientScriptBlock(Page, Page.GetType(), Guid.NewGuid().ToString(), "alert('Update is successfu.');",True)
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