i want a web services refrefrence for autocompleteextender control of ajax control tool kit

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Ajax

hi
I need to create a dropdown list for textboxes, we should be able to search the contents in the database to fit it in the textbox. The first few letters typin in the textbox must show the related words with resembling names in database. like google

so i want a webservice refrence for autocomplete extender control of ajax tool kit