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.NET Forum / ASP.NET / Web Services / June 2004

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Using Session from a Windows App throgh a WebService

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Per Loevgren - 28 Jun 2004 15:19 GMT
I want to set and get information in a Session variable on an IIS
application (ASP.NET website) from a Windows App.

I use webservices to communicate with the IIS app. and keep all calls
from the webservices in the same session.

I have deployed my webservices to the folder where the IIS app resides
and when I call to get the value of an Application variabel there are
no problems, but as soon as I call to get the value of a Session
variable I get an exception.

If i call the webservice from my ASP.NET app. there are no problems
with the session variable.

The Webservice looks as follows:

using System;
using System.Collections;
using System.ComponentModel;
using System.Data;
using System.Diagnostics;
using System.Web;
using System.Web.Services;

namespace StatusWS
{

public class GetStatus : System.Web.Services.WebService
{
    public GetStatus()
    {
        //CODEGEN: This call is required by the ASP.NET Web Services
Designer
        InitializeComponent();
    }

    #region Component Designer generated code
   
    //Required by the Web Services Designer
    private IContainer components = null;
               
    /// <summary>
    /// Required method for Designer support - do not modify
    /// the contents of this method with the code editor.
    /// </summary>
    private void InitializeComponent()
    {
    }
    /// <summary>
    /// Clean up any resources being used.
    /// </summary>
    protected override void Dispose( bool disposing )
    {
        if(disposing && components != null)
        {
            components.Dispose();
        }
        base.Dispose(disposing);       
    }
   
    #endregion

    [WebMethod (EnableSession=true)]
    public string GetStatusApplication( string strSerialNo, string OTP )
    {
        string strStatus = Application["Status"] != null ?
Application["Status"].ToString() : "<No status found>";
        return Server.HtmlEncode(strStatus);
        }

    [WebMethod (EnableSession=true)]
    public string GetStatusSession( string strSerialNo, string OTP )
    {
        string strStatus = Session["Status"] != null ?
Session["Status"].ToString() : "<No status found>";
        return Server.HtmlEncode(strStatus);
    }
}
}

I have deployed it by copying the asmx file to the ASP.NET application
folder, and added a webreference to it in my windows app.

The windows app. calls like this:

private void button1_Click(object sender, System.EventArgs e)
{
textBox1.Text = new StatusWS.GetStatus().GetStatusSession( "", "" );
}

private void button2_Click(object sender, System.EventArgs e)
{
textBox2.Text = new StatusWS.GetStatus().GetStatusApplication( "", ""
);
}

I have tried to set CookieContainer on my webservice object but that
didn't do any good.

Any ideas or thoughts are most welcome

Rgds.,

Per Loevgren
Kondratyev Denis - 28 Jun 2004 21:37 GMT
Show code for this.

> I have tried to set CookieContainer on my webservice object but that
> didn't do any good.
[quoted text clipped - 4 lines]
>
> Per Loevgren
Per Loevgren - 29 Jun 2004 10:52 GMT
I found the solution.

What I did wrong was to create a new CookieContainer for each call to
the webservice.

Instead I have create a private variable to hold the CookieContainer
and then only set this variable if its value is null.

i.e.:

private CookieContainer thisCookie;

private void button1_Click(object sender, System.EventArgs e)
{
    StatusWS.GetStatus objWS = new StatusWS.GetStatus();
    if ( thisCookie == null )
    {
        thisCookie = new CookieContainer();
    }
    objWS.CookieContainer = thisCookie;
    textBox1.Text = objWS.GetStatusSession( "", "" );
}

Rgds.,

Per Loevgren
Per Loevgren - 29 Jun 2004 07:56 GMT
Some info i forgot in my previous post ...

The code that sets the CookieContainer is like this:

private void button1_Click(object sender, System.EventArgs e)
{
    StatusWS.GetStatus objTest = new StatusWS.GetStatus();
    objTest.CookieContainer = new CookieContainer();
    textBox1.Text = objTest.GetStatusSession( "", "" );
}

The exception thrown is:

An unhandled exception of type
'System.Web.Services.Protocols.SoapException' occurred in
system.web.services.dll

Additional information: System.Web.Services.Protocols.SoapException:
Server was unable to process request. --->
System.NullReferenceException: Object reference not set to an instance
of an object.
  at StatusWS.GetStatus.GetStatusSession(String strSerialNo, String
OTP) in c:\inetpub\wwwroot\statusws\statusws.asmx.cs:line 64
  --- End of inner exception stack trace ---

Rgds.,

Per Loevgren

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