Creating webservice methods in asp.net application

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ASP.NET

Hi,

I created one .asmx.cs in my webapplication in that getProducts() is the web method name foe getting products information from my database.when i run this application it shows the error as

HTTP Error 401.2 - Unauthorized
You are not authorized to view this page due to invalid authentication headers.


Detailed Error Information:
Module     IIS Web Core
Notification       AuthenticateRequest
Handler    PageHandlerFactory-Integrated-4.0
Error Code     0x80070005
Requested URL      http://localhost:1643/UI/Default.aspx
Physical Path      D:\Admin Site\ReCon\UI\Default.aspx
Logon Method       Not yet determined
Logon User     Not yet determined
Request Tracing Directory      C:\Users\kalpana\Documents\IISExpress\TraceLogFiles\RECON

Please correct me.
Thanks in advance.