Get claims for service using Windows validation/authentication - wcf

Question

I have the following code which was validation using username & password.
How can I use Windows credentials instead?
private static SecurityToken GetClaims(string serviceurl, string username, string password)
{
bool isincurrentusercontext = String.IsNullOrEmpty(username);
WS2007HttpBinding binding = new WS2007HttpBinding();
binding.Security.Mode = SecurityMode.TransportWithMessageCredential;
binding.Security.Message.EstablishSecurityContext = false;
EndpointAddress endpoint = new EndpointAddress(new Uri(GetStsUrl(isincurrentusercontext)));
WSTrustChannelFactory trustChannelFactory;
if (!isincurrentusercontext)
{
binding.Security.Transport.ClientCredentialType = HttpClientCredentialType.None;
binding.Security.Message.ClientCredentialType = MessageCredentialType.UserName;
trustChannelFactory = new WSTrustChannelFactory(binding, endpoint);
trustChannelFactory.Credentials.UserName.UserName = username;
trustChannelFactory.Credentials.UserName.Password = password;
}
else
trustChannelFactory = new WSTrustChannelFactory(new KerberosWSTrustBinding(SecurityMode.TransportWithMessageCredential), endpoint);
trustChannelFactory.TrustVersion = TrustVersion.WSTrust13;
trustChannelFactory.Credentials.UseIdentityConfiguration = true;
WSTrustChannel channel = null;
RequestSecurityToken rst = new RequestSecurityToken(RequestTypes.Issue);
rst.AppliesTo = new EndpointReference(serviceurl);
rst.KeyType = KeyTypes.Bearer;
channel = (WSTrustChannel)trustChannelFactory.CreateChannel();
SecurityToken token = channel.Issue(rst);
((IChannel)channel).Close();
channel = null;
trustChannelFactory.Close();
trustChannelFactory = null;
return token;
}
If I change,
binding.Security.Message.ClientCredentialType = MessageCredentialType.UserName;
to
binding.Security.Message.ClientCredentialType = MessageCredentialType.Windows;
and remove these two statements,
trustChannelFactory.Credentials.UserName.UserName = username;
trustChannelFactory.Credentials.UserName.Password = password;
and when i run this statement,
SecurityToken token = channel.Issue(rst);
I get the following error,
Secure channel cannot be opened because security negotiation with the
remote endpoint has failed. This may be due to absent or incorrectly
specified EndpointIdentity in the EndpointAddress used to create the
channel. Please verify the EndpointIdentity specified or implied by
the EndpointAddress correctly identifies the remote endpoint