How to pass network credentials to a web service using WCF framework?

I am using WCF to communicate with a web service. I need to do use network credentials to communicate with the web service. I have the below two lines to create the channel. Is there any property on the ChannelFactory to set the network credentials? Thank you.

System.ServiceModel.ChannelFactory<FFWebService.FFChannel> channelFactory = new System.ServiceModel.ChannelFactory<FFChannel>("FFOrderPort");
            FFWebService.FFChannel channel = channelFactory.CreateChannel();
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Vel EousResearch & Development ManagerCommented:
You need to set the security mode and credentials of the service binding:

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ipjyoAuthor Commented:
Thank you.
Victor SagayarajFinalYear ProjectCommented:
How to send credentials from silverlight to web service....
Everytime i'm getting the authentication dialog when i run my application
Below is my code:

BasicHttpBinding AdminService_Binding = new BasicHttpBinding();
EndpointAddress WM_AdminService_Endpoint = new EndpointAddress(ConfigManager.WM_AdminServiceURL);

WebRequest.RegisterPrefix("https://", WebRequestCreator.ClientHttp);
                MyAdminService.ClientCredentials.UserName.UserName = ConfigManager.ListenerServiceUserName;
                MyAdminService.ClientCredentials.UserName.Password = ConfigManager.ListenerServicePassword;
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