how to secure .asmx services via api key in Asp.net

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I have some web services in my .asmx file. I want to secure these services via a key so that anyone who has the key can only use these services. I can not change the services so that I can not add key in method arguments. please suggest me the way how to achieve it by using any handler or global.asmx file.

asked 33 secs ago

Anonymous

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how to secure .asmx services via api key in Asp.net