c# - WCF change endpoint address at runtime

Question

I have my first WCF example working. I have the host on a website which have many bindings. Because of this, I have added this to my web.config.

<serviceHostingEnvironment multipleSiteBindingsEnabled="true"/>

This is my default binding http://id.web, which works with the following code.

EchoServiceClient client = new EchoServiceClient();
litResponse.Text = client.SendEcho("Hello World");
client.Close();

I am now trying to set the endpoint address at runtime. Even though it is the same address of the above code.

EchoServiceClient client = new EchoServiceClient();
client.Endpoint.Address = new EndpointAddress("http://id.web/Services/EchoService.svc"); 

litResponse.Text = client.SendEcho("Hello World");
client.Close();

The error I get is:

The request for security token could not be satisfied because authentication failed. 

Please suggest how I may change the endpoint address at runtime?

Additional here is my client config, requested by Ladislav Mrnka

 <system.serviceModel>
        <bindings>
            <wsHttpBinding>
                <binding name="WSHttpBinding_IEchoService" closeTimeout="00:01:00"
                    openTimeout="00:01:00" receiveTimeout="00:10:00" sendTimeout="00:01:00"
                    bypassProxyOnLocal="false" transactionFlow="false" hostNameComparisonMode="StrongWildcard"
                    maxBufferPoolSize="524288" maxReceivedMessageSize="65536"
                    messageEncoding="Text" textEncoding="utf-8" useDefaultWebProxy="true"
                    allowCookies="false">
                    <readerQuotas maxDepth="32" maxStringContentLength="8192" maxArrayLength="16384"
                        maxBytesPerRead="4096" maxNameTableCharCount="16384" />
                    <reliableSession ordered="true" inactivityTimeout="00:10:00"
                        enabled="false" />
                    <security mode="None" />
                </binding>
            </wsHttpBinding>
        </bindings>
        <client>
            <endpoint address="http://id.web/Services/EchoService.svc" binding="wsHttpBinding"
                bindingConfiguration="WSHttpBinding_IEchoService" contract="IEchoService"
                name="WSHttpBinding_IEchoService">
                <identity>
                    <servicePrincipalName value="host/mikev-ws" />
                </identity>
            </endpoint>
        </client>
    </system.serviceModel>

Answer 1

So your endpoint address defined in your first example is incomplete. You must also define endpoint identity as shown in client configuration. In code you can try this:

EndpointIdentity spn = EndpointIdentity.CreateSpnIdentity("host/mikev-ws");
var address = new EndpointAddress("http://id.web/Services/EchoService.svc", spn);   
var client = new EchoServiceClient(address); 
litResponse.Text = client.SendEcho("Hello World"); 
client.Close();

Actual working final version by valamas

EndpointIdentity spn = EndpointIdentity.CreateSpnIdentity("host/mikev-ws");
Uri uri = new Uri("http://id.web/Services/EchoService.svc");
var address = new EndpointAddress(uri, spn);
var client = new EchoServiceClient("WSHttpBinding_IEchoService", address);
client.SendEcho("Hello World");
client.Close();