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WebService.Application Property

Gets the application object for the current HTTP request.

Namespace:  System.Web.Services
Assembly:  System.Web.Services (in System.Web.Services.dll)

public HttpApplicationState Application { get; }

XML Web services can use both application state and session state. Application state is maintained across all sessions accessing an XML Web service regardless of whether session state is turned off for a method(by using the EnableSession property of the WebMethodAttribute).

The example below demonstrates a hit counter, incrementing the count every time a browser calls the XML Web service method.

<%@ WebService Language="C#" Class="Util"%>
 using System.Web.Services;

 public class Util: WebService {
   [ WebMethod(Description="Application Hit Counter",EnableSession=false)]
    public int HitCounter() {
       if (Application["HitCounter"] == null) {
          Application["HitCounter"] = 1;
       else {
          Application["HitCounter"] = ((int) Application["HitCounter"]) + 1;
       return ((int) Application["HitCounter"]);

.NET Framework

Supported in: 4.5, 4, 3.5, 3.0, 2.0, 1.1, 1.0

.NET Framework Client Profile

Supported in: 3.5 SP1

Windows 8.1, Windows Server 2012 R2, Windows 8, Windows Server 2012, Windows 7, Windows Vista SP2, Windows Server 2008 (Server Core Role not supported), Windows Server 2008 R2 (Server Core Role supported with SP1 or later; Itanium not supported)

The .NET Framework does not support all versions of every platform. For a list of the supported versions, see .NET Framework System Requirements.

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