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

In this blog, you will learn about Sessions in Web Services.

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

1. Import “System.Web.Services.WebServices”.
2. Enable the web method attribute as EnableSession=true.
3. At ClientSide, enable the allowcookies=true in web.config file.

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