Throttling | WCF Tutorial pdf

WCF throttling provides some properties that you can use to limit how many instances or sessions are created at the application level. Performance of the WCF service can be improved by creating proper instance.
Table:
Service Throttling can be configured either Adminstractive or Programatically

Administrative(configuration file):
Using <serviceThr ottling> tag of the Service Behavior, you can configure the maxConcurrentCalls, maxConcurrentInstances , maxConcurrentSessions property as shown below.
<system.serviceModel>
   <services >
     <service behaviorConfiguration="ServiceBehavior"  name="MyService">
       <endpoint address="" binding="wsHttpBinding" contract="IMyService">
         <identity>
           <dns value="localhost"/>
         </identity>
       </endpoint>
       <endpoint address="mex" binding="mexHttpBinding"
contract="IMetadataExchange"/>
     </service>
   </services>
   <behaviors>
     <serviceBehaviors>
       <behavior name="ServiceBehavior">
         <serviceMetadata httpGetEnabled="true"/>
         <serviceDebug includeExceptionDetailInFaults="true "/>
         <serviceThrottling maxConcurrentCalls="500"
 maxConcurrentInstances ="100" 
maxConcurrentSessions ="200"/>
       </behavior>
     </serviceBehaviors>
   </behaviors>
 </system.serviceModel>
Programming Model:
Use ServiceThrottlingBehavior object to set concurrent calls, session and instance property.
           ServiceHost host = new ServiceHost(typeof(MyService));
          ServiceThrottlingBehavior throttle  = host.Description.Behaviors.Find();
           if (throttle == null)
           {
               throttle = new ServiceThrottlingBehavior();
               throttle.MaxConcurrentCalls = 500;
                 throttle.MaxConcurrentSessions = 200;
               throttle.MaxConcurrentInstances = 100;
               host.Description.Behaviors.Add(throttle);
           }

           host.Open();