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raise click event from javascript

Posted By:      Posted Date: September 08, 2010    Points: 0   Category :ASP.Net
HiI want to raise click event on linkbutton, when press "Enter ?" on textbox.I wrote this code:LinkButton1.Attributes.Add("onclick", myscript);but, can not call LinkButton1.onclick() , my linkbutton:href='javascript:WebForm_DoPostBackWithOptions(new%20WebForm_PostBackOptions("ctl00$ContentPlaceHolder1$Login1$lbtEnter",%20"",%20true,%20"LoginGroup",%20"",%20false,%20true))'when call ctl00$ContentPlaceHolder1$Login1$lbtEnter.onclick();Error: ctl00_ContentPlaceHolder1_Login1_lbtEnter is not define

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