WCF Error {"The username is not provided. Specify username in ClientCredentials."} - web-services

Question

I have a WCF webservice hosted in IIS. Here is the configuration of the same:
When i try to consume this particular service (when added as a service reference) in my WinForms client, it throw this exception:
The username is not provided. Specify username in ClientCredentials.
But when i add the service as a "web reference", i can execute all the methods perfectly.
<system.serviceModel>
<bindings>
<basicHttpBinding>
<binding name="BasicHttpEndpointBinding">
<security mode="TransportCredentialOnly">
<transport clientCredentialType="Basic" />
<message clientCredentialType="UserName" algorithmSuite="Default" />
</security>
</binding>
</basicHttpBinding>
</bindings>
<services>
<service behaviorConfiguration="EMSServiceBehavior"
name="EMSService.EMSCRUD">
<endpoint address="" binding="basicHttpBinding"
bindingConfiguration="BasicHttpEndpointBinding"
name="BasicHttpEndpoint" contract="EMSService.IEMSCRUD">
</endpoint>
</service>
</services>
<behaviors>
<serviceBehaviors>
<behavior name="EMSServiceBehavior">
<!-- To avoid disclosing metadata information, set the values below to false before deployment -->
<serviceMetadata httpGetEnabled="true" httpsGetEnabled="true" />
<!-- To receive exception details in faults for debugging purposes, set the value below to true. Set to false before deployment to avoid disclosing exception information -->
<serviceDebug includeExceptionDetailInFaults="false" />
<!--<serviceCredentials>
<windowsAuthentication allowAnonymousLogons="False" includeWindowsGroups="True"/>
</serviceCredentials>-->
</behavior>
</serviceBehaviors>
</behaviors>
<protocolMapping>
<add binding="basicHttpsBinding" scheme="https" />
</protocolMapping>
<serviceHostingEnvironment aspNetCompatibilityEnabled="true" multipleSiteBindingsEnabled="true" />
</system.serviceModel>
Code when added as a service reference:
EE.EMSCRUDClient obj = new EE.EMSCRUDClient();
obj.ClientCredentials.Windows.ClientCredential.UserName = "demo";
obj.ClientCredentials.Windows.ClientCredential.Password = "demo";
obj.ClientCredentials.Windows.ClientCredential.Domain = "demo";
obj.somemethod(); //Error here
Code when added as a web reference:
testEMService.EMSCRUD ob = new testEMService.EMSCRUD();
ICredentials credentials = new NetworkCredential("user", "pass");
ob.Credentials = credentials;
ob.somemethod();//No error

Answer 1

First you can change in the config the security mode to Transport instead of TransportCredentialOnly (if there is no particular reason for it).
Second, which I am sure it makes the error is that you are setting the credentials on Windows level in the code. It should be:
obj.ClientCredentials.UserName.UserName = "user";
obj.ClientCredentials.UserName.Password = "pass";