This will display the server side control name which is used for jquery alert($(“[id$=TextBoxTest]”).attr(“id”)); If you use Telerik, it will display ‘ctl00_ContentPlaceHolder1_CostOfTraining1_TextBoxTest’ when calling Telerik server side control from client side. Then you can use it to do anything at client side like: $(‘#ctl00_ContentPlaceHolder1_CostOfTraining1_TextBoxTest’).keyup(function(event) { Do something(); });