Web service in asp.net using C#

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C#

I have written a stored procedure to check wether a username and passsword exist in table or not then I have written a web method in web service where I have col stored procedure and now I want to execute this method in button click of my login page aspx..so how shpuld I do this...please let me know how we cal or refer the web method in our website I know how we add the web reference..hello world example is too simple to get but please explain me on any other complicated web method or on this login page..