Ajax autocomplete textbox in EditItemTemaplate of GridView

In this example i am implementing the AutoComplete functionality to textbox in the EditItemTemaplate of GridView using AJAX autocomplete extender, for this we need to create a web service which calls the method to fetch data from database and display results as suggestions for textbox For this add a new webservice to the project and name it AutoComplete.asmx or whatever you want, in the code behind of the web service we write methods to get the records from database and a web method called GetCompletionList which takes text entered in textbox as parameter to search database , this method gets automatically called when ever user types anything in the textbox, the code for this web service is like this