How to Add Token credentials to UserNameTokens Class ( Webservice Proxy)

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ASP.NET

I am not able to see a "RequestSoapContext" under my proxy of webservice...? I have installed WSE 2.0.
1)UsernameToken token = new UsernameToken("uname", "pwd", PasswordOption.SendPlainText);
Service.Security.Tokens.Add(token);

2)UsernameToken token = new UsernameToken("uname", "pwd", PasswordOption.SendPlainText);
Service.RequestSoapContext.Security.Tokens.Add(token);

3)SoapContext requestContext = MyWebServiceInstance.RequestSoapContext;


I tried in there ways but no use 

thanks in advance Some how cretical plz try it..