Create Durable Service In C#.NET

Step 1: Start Visual Studio and click File->New->Web Site. Select the 'WCF Service' and give name Durableservice

Step 2: Rename Service.svc to SimpleCalculator.svc and also change Service.cs to SimpleCalculator.cs and IService.cs to ISimpleCalculator.cs

Step 3: Go to SimpleCalculator.svc and change the code as given below:

<%@ ServiceHost Language="C#" Debug="true" Service="SimpleCalculator" CodeBehind="~/App_Code/SimpleCalculator.cs" %>

Step 4: Go to ISimpleCalculator.cs and add the below code

Step 5: Go to SimpleCalculator.cs and write the code as given below.

using System;
using System.Collections.Generic;
using System.Linq;
using System.Runtime.Serialization;
using System.ServiceModel;
using System.ServiceModel.Web;
using System.Text;
using System.ServiceModel.Description;
[Serializable]
[DurableService()]
// NOTE: You can use the "Rename" command on the "Refactor" menu to change the class name "Service" in code, svc and config file together.
public class SimpleCalculator : ISimpleCalculator
{
int currentValue = default(int);
[DurableOperation(CanCreateInstance = true)]
public int Add(int num)
{
return (currentValue += num);
}
[DurableOperation()]
public int Subtract(int num)
{
return (currentValue -= num);
}
[DurableOperation()]
public int Multiply(int num)
{
return (currentValue *= num);
}
[DurableOperation(CompletesInstance = true)]
public void EndPersistence()
{
}
}

Step 6: To set up the database environment, run the these sql query located at following location 'C:\Windows\Microsoft.NET\Framework\v3.5\SQL\EN'

SqlPersistenceProviderSchema.sql and SqlPersistenceProviderLogic.sql

Step 7: Go to web.config and do same as written here.

<system.serviceModel>
<services>
<service name="SimpleCalculator" behaviorConfiguration="ServiceBehavior">
<endpoint address="http://localhost:5174/Durableservice/SimpleCalculator.svc" binding="wsHttpContextBinding"
bindingConfiguration="browConfig" contract="ISimpleCalculator">
<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"/>
<persistenceProvider
type="System.ServiceModel.Persistence.SqlPersistenceProviderFactory,
System.WorkflowServices, Version=3.5.0.0, Culture=neutral,
PublicKeyToken=31bf3856ad364e35" connectionStringName="DurableServiceStore"
persistenceOperationTimeout="00:00:10"
lockTimeout="00:01:00"
serializeAsText="true"/>
</behavior>
</serviceBehaviors>
</behaviors>
<bindings>
<wsHttpContextBinding >
<binding name="browConfig" >
<security mode="None"></security>
</binding>
</wsHttpContextBinding>
</bindings>
</system.serviceModel>
Step 8: Set connection string also
<connectionStrings>
<add name="DurableServiceStore"
connectionString="Data Source=IT-WSPC-F10\SQL;Initial Catalog =DurableServiceStore;Integrat Security=True"/>
</connectionStrings>

Run the code. For more details, download the attached code.