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　　在默认情况下，.NET下的WebService是无状态的。不过可以用ASP.NET提供的状态管理那就是Session和Application。这使得WebService下状态管理变得简单了，只需使用Webmethod属性的Enablesession子属性就可，即[WEBMETHO(ENABLESESSION=TRUE)]

　　服务端代码如下:

[WebMethod(EnableSession= true)]
public client GetClientState()
{
cstate = (client)Session["clientstate"];
if (cstate == null)
{
cstate = new client();
Session["clientstate"] = cstate;
}

return cstate;
}
[WebMethod(EnableSession = true)]
public void click()
{
client c = this.GetClientState();
c.requsest++;

}

}
public class client
{
public int requsest;
}

　　先创建一个CLIENT类,用于表示客户端连接的次数,GetClientState()方法用于返回当前用户的状态.

　　客户端代码如下:

partial class Form1 : Form
{
webstate.Service ws ;
webstate.client c;
public Form1()
{
InitializeComponent();
ws = new testwebstate.webstate.Service();
ws.CookieContainer = new System.Net.CookieContainer();
//设置COOKIE容器,以便代理对象能正确使用COOKIE来提供状态信息
}

private void button1_Click(object sender, EventArgs e)
{
ws.click();//每点击一次,当前用户的CLIENT STATE的REQUEST就++
c = ws.GetClientState();//获取状态信息
MessageBox.Show("you have click" + c.requsest + "times");
}
}

　　以上的是Seesion的状态管理,下面介绍Application.

　　服务端代码如下:

[WebServiceBinding(ConformanceClaims = WsiClaims.BP10, EmitConformanceClaims = true)]
public class Service : System.Web.Services.WebService
{
ArrayList clist;

[WebMethod]
public string GetHistory()
{
StringBuilder xbuider = new StringBuilder();//要添加USING SYSTEM.TEXT;
clist = (ArrayList)Application["client"];
if (clist == null)
{
clist = new ArrayList();
Application["client"] = clist;
}
foreach (client c in clist)
{
xbuider.Append(c.name + "" + c.request +"" + "\r\n");

}
return xbuider.ToString();

}
[WebMethod]
public void click(ref client c)//这里用的是传递对象的引用
{
clist = (ArrayList)Application["client"];
if (clist == null)
{
clist = new ArrayList();
Application["client"] = clist;
}
clist.Add(c);

}

}
public class client
{
public int request;
public string name;
}

　　客户端代码如下:

partial class Form1 : Form
{

webstate.client c;
public Form1()
{
InitializeComponent();
c = new testwebstate2.webstate.client();
c.name = "jisiki";

}

private void button1_Click(object sender, EventArgs e)
{

c.request++;
webstate.Service s = new testwebstate2.webstate.Service();
s.click(ref c);//这里用的是传递对象的引用
this.richTextBox1.Text = s.GetHistory();

}
}

　　对于WebService而言,Application属性总是可用的，Application返回Httpapplicationatate类的一个实例,它能存储来自任何客户端的可访问的"名称/值".