How to secure my asmx web methods only to be called by my asp.net web application ?

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ASP.NET

WebForms

ASMX

webservice

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Hi Friends,

I have a web application which is having an asmx web service holding some web methods. Those are being called through jQuery ajax method to get data or do various operations.

I want it to be accessed by only my web application and no other ways to call the web methods and this should be a fully secured one.

Can any body suggest on what are the security threats might affect my web methods and how i can protect them from those threats ?

Any suggestions are appreciated.