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conditional alert on button click

Posted By:      Posted Date: September 25, 2010    Points: 0   Category :ASP.Net

Hi all:
I have a textbox,listbox and button  enclosed in updatepanel. I want to that if user types something and click the button, if will check in db, if that values exist in db, then it will be added in listbox, otherwise a javascript alert will be shown saying, 'value1' does not exist in database. How can I do this. I tried foloowing code in button click but it is not showing alert.
 String myscript = "alert('I am here');";
 Page.ClientScript.RegisterStartupScript(this.GetType(), "myscript", myscript, true);

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