can we debug web service which is there at local site?

i am trying to use autocomplte control . but not getting result. it is displaying as a text box only.
i tried to debug my web service. but control is not going to web service.
my code is below:

 <asp:TextBox runat="server" ID="myTextBox" Width="300" />             <ajax:AutoCompleteExtender                 runat="server" 

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