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)

  1. public class MyWebService: System.Web.Services.WebService {
  2. [WebMethod(MessageName = "AddTwoNumbers", Description = "Add Two Numbers; Paratmeters: double firstNumber, double secondNumber", EnableSession = true)]
  3. public string AddTwoNumbers(double firstNumber, double secondNumber) {
  4. List < string > lstAddedTwoNumbers;
  5. if (Session["AddedTwoNumbers"] == null) {
  6. lstAddedTwoNumbers = new List < string > ();
  7. } else {
  8. lstAddedTwoNumbers = (List < string > ) Session["AddedTwoNumers"];
  9. }
  10. lstAddedTwoNumbers.Add(string.Format("{0} + {1} = {2}", firstNumber.ToString(), secondNumber.ToString(), (firstNumber + secondNumber)));
  11. Session["AddedTwoNumbers"] = lstAddedTwoNumbers;
  12. return Convert.ToString(firstNumber + secondNumber);
  13. }
  14. [WebMethod(MessageName = "AddThreeNumbers", Description = "Add three numbers; Paratmeters: double firstNumber, double secondNumber, double thirdNumber", EnableSession = true)]
  15. public string AddThreeNumbers(double firstNumber, double secondNumber, double thirdnumber) {
  16. return Convert.ToString(firstNumber + secondNumber + thirdnumber);
  17. }
  18. [WebMethod(Description = "Get All the numbers added with AddTwoNumbers", EnableSession = true)]
  19. public List < string > GetAddedNumbersFromSession() {
  20. if (Session["AddedTwoNumbers"] != null) return (List < string > ) Session["AddedTwoNumbers"];
  21. else {
  22. List < string > data = new List < string > ();
  23. data.Add("No record found");
  24. return data;
  25. }
  26. }
  27. }

In ASP.NET Client Code:

(set allowCookies=”true”)

  1. <?xml version="1.0"?>
  2. <!--
  4. For more information on how to configure your ASP.NET application, please visit
  6. http://go.microsoft.com/fwlink/?LinkId=169433
  8. -->
  9. <configuration>
  10. <system.web>
  11. <compilation debug="true" targetFramework="4.5">
  12. <assemblies>
  13. <add assembly="Microsoft.Web.Infrastructure, Version=1.0.0.0, Culture=neutral, PublicKeyToken=31BF3856AD364E35" /> </assemblies>
  14. </compilation>
  15. <httpRuntime targetFramework="4.5" executionTimeout="1000" />
  16. <sessionState timeout="1000" /> </system.web>
  17. <system.serviceModel>
  18. <bindings>
  19. <basicHttpBinding>
  20. <binding name="MyWebServiceSoap" allowCookies="true" sendTimeout="00:10:00" receiveTimeout="00:10:00" /> </basicHttpBinding>
  21. </bindings>
  22. <client>
  23. <endpoint address="http://localhost:1810/MyWebService.asmx" binding="basicHttpBinding" bindingConfiguration="MyWebServiceSoap" contract="ServiceReference1.MyWebServiceSoap" name="MyWebServiceSoap" /> </client>
  24. </system.serviceModel>
  25. </configuration>

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

  1. protected void btnAddTwoNumbers_Click(object sender, EventArgs e) {
  2. ServiceReference1.MyWebServiceSoapClient client = new ServiceReference1.MyWebServiceSoapClient();
  3. lblResult1.Text = String.Format("Answer: {0} + {1} = {2}", txtfirstNumber1.Text, txtsecondNumber1.Text, client.AddTwoNumbers(Convert.ToDouble(txtfirstNumber1.Text), Convert.ToDouble(txtsecondNumber1.Text)));
  4. grdAllResults1.DataSource = client.GetAddedNumbersFromSession();
  5. grdAllResults1.DataBind();
  6. }

Output