Web Services Using C# - Chapter 5 - Sessions In Web Services

In order to enable Sessions in Web Services, we have to follow the following three steps:

In Web Service Code: (set EnableSession = true)

public class MyWebService: System.Web.Services.WebService {
[WebMethod(MessageName = "AddTwoNumbers", Description = "Add Two Numbers; Paratmeters: double firstNumber, double secondNumber", EnableSession = true)]
public string AddTwoNumbers(double firstNumber, double secondNumber) {
List < string > lstAddedTwoNumbers;
if (Session["AddedTwoNumbers"] == null) {
lstAddedTwoNumbers = new List < string > ();
} else {
lstAddedTwoNumbers = (List < string > ) Session["AddedTwoNumers"];
}
lstAddedTwoNumbers.Add(string.Format("{0} + {1} = {2}", firstNumber.ToString(), secondNumber.ToString(), (firstNumber + secondNumber)));
Session["AddedTwoNumbers"] = lstAddedTwoNumbers;
return Convert.ToString(firstNumber + secondNumber);
}
[WebMethod(MessageName = "AddThreeNumbers", Description = "Add three numbers; Paratmeters: double firstNumber, double secondNumber, double thirdNumber", EnableSession = true)]
public string AddThreeNumbers(double firstNumber, double secondNumber, double thirdnumber) {
return Convert.ToString(firstNumber + secondNumber + thirdnumber);
}
[WebMethod(Description = "Get All the numbers added with AddTwoNumbers", EnableSession = true)]
public List < string > GetAddedNumbersFromSession() {
if (Session["AddedTwoNumbers"] != null) return (List < string > ) Session["AddedTwoNumbers"];
else {
List < string > data = new List < string > ();
data.Add("No record found");
return data;
}
}
}

In ASP.NET Client Code:

(set allowCookies=”true”)

<?xml version="1.0"?>
<!--
For more information on how to configure your ASP.NET application, please visit
http://go.microsoft.com/fwlink/?LinkId=169433
-->
<configuration>
<system.web>
<compilation debug="true" targetFramework="4.5">
<assemblies>
<add assembly="Microsoft.Web.Infrastructure, Version=1.0.0.0, Culture=neutral, PublicKeyToken=31BF3856AD364E35" /> </assemblies>
</compilation>
<httpRuntime targetFramework="4.5" executionTimeout="1000" />
<sessionState timeout="1000" /> </system.web>
<system.serviceModel>
<bindings>
<basicHttpBinding>
<binding name="MyWebServiceSoap" allowCookies="true" sendTimeout="00:10:00" receiveTimeout="00:10:00" /> </basicHttpBinding>
</bindings>
<client>
<endpoint address="http://localhost:1810/MyWebService.asmx" binding="basicHttpBinding" bindingConfiguration="MyWebServiceSoap" contract="ServiceReference1.MyWebServiceSoap" name="MyWebServiceSoap" /> </client>
</system.serviceModel>
</configuration>

Add a GridView to view session details,
Modify code to view the result.

protected void btnAddTwoNumbers_Click(object sender, EventArgs e) {
ServiceReference1.MyWebServiceSoapClient client = new ServiceReference1.MyWebServiceSoapClient();
lblResult1.Text = String.Format("Answer: {0} + {1} = {2}", txtfirstNumber1.Text, txtsecondNumber1.Text, client.AddTwoNumbers(Convert.ToDouble(txtfirstNumber1.Text), Convert.ToDouble(txtsecondNumber1.Text)));
grdAllResults1.DataSource = client.GetAddedNumbersFromSession();
grdAllResults1.DataBind();
}

Output