Authorization in the web service, and a deserialization error. Where to dig?

Question

C++ / C#

Hi friends.
I'm using the class generated through "Add Connected Service" to access the web service.
And I'm currently struggling with two problems.
First

private static Binding GetBindingForEndpoint(EndpointConfiguration endpointConfiguration)
        {
            if ((endpointConfiguration == EndpointConfiguration.ПФ_ПорталДПОSoap))
            {
                BasicHttpBinding result = new BasicHttpBinding(BasicHttpSecurityMode.Transport);
                result.Security.Transport.ClientCredentialType = HttpClientCredentialType.Basic;

                result.MaxBufferSize = int.MaxValue;
                result.ReaderQuotas = System.Xml.XmlDictionaryReaderQuotas.Max;
                result.MaxReceivedMessageSize = int.MaxValue;
                result.AllowCookies = true;
                return result;
            }
            if ((endpointConfiguration == EndpointConfiguration.ПФ_ПорталДПОSoap12))
            {
                CustomBinding result = new System.ServiceModel.Channels.CustomBinding();
                System.ServiceModel.Channels.TextMessageEncodingBindingElement textBindingElement = new System.ServiceModel.Channels.TextMessageEncodingBindingElement();
                textBindingElement.MessageVersion = System.ServiceModel.Channels.MessageVersion.CreateVersion(EnvelopeVersion.Soap12, System.ServiceModel.Channels.AddressingVersion.None);
                result.Elements.Add(textBindingElement);
                System.ServiceModel.Channels.HttpTransportBindingElement httpBindingElement = new System.ServiceModel.Channels.HttpTransportBindingElement();
                httpBindingElement.AllowCookies = true;
                httpBindingElement.MaxBufferSize = int.MaxValue;
                httpBindingElement.MaxReceivedMessageSize = int.MaxValue;
                result.Elements.Add(httpBindingElement);
                return result;
            }
            throw new System.InvalidOperationException(string.Format("Could not find endpoint with name \'{0}\'.", endpointConfiguration));
        }

In this code, in the first version (for version 1.1), I indicated

BasicHttpBinding result = new BasicHttpBinding(BasicHttpSecurityMode.Transport);
                result.Security.Transport.ClientCredentialType = HttpClientCredentialType.Basic;

and it works great.
How can I set up the second option? Where to substitute ClientCredential... I did not find this possibility in the CustomBinding type.
The second problem is
Error in deserializing body of reply message for operation / And this problem is with half of the methods.
Maybe someone came across?