Query: Authentication Error while consuming a web service

Hi All,
I've generted a WSDL file by using the following steps.
1.Created a RFC enabled ABAP pgm
2.Created a web service out of it (using webservice creation wizard - default virtual host. so my port is 8100)3.Released the web service (WSCONFIG)
4.Generated the WSDL file (WSADMIN + CTRL F1).
Then I wanted to consume it from a .Net program. But am getting authentication error in .Net.
Do I need to configure anything for Authentication (username and password) from R/3 side?..
How Do I pass the credential info from .Net?.
Should I take care of any setup other than what I've specified?.
Any Blogs or response would be appreciated.
Thanks,
Joe.

Usually like this:
WSReference1.WSPProxy proxy = new WSReference1.WSPProxy();
proxy.Credentials = new System.Net.NetworkCredentials("Username", "Password");
proxy.PreAuthenticate = true;
proxy.CallMethod();

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