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Old July 2nd, 2003, 09:39 AM
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Default How to call WMI from web service?


I have trouble to call WMI from the web service.

The code is like the following:

using System;

using System.Collections;

using System.ComponentModel;

using System.Data;

using System.Diagnostics;

using System.Web;

using System.Web.Services;

using System.Text;

using System.Management;

using System.Configuration;

namespace MyWMI


    /// <summary>

    /// Summary description for ADSSrv.

    /// </summary>


    public class MyWMI : System.Web.Services.WebService


        public MyWMI()


            //CODEGEN: This call is required by the ASP.NET Web Services Designer



        #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)








        public string MyTest()




                ManagementClass someClass = new ManagementClass("\\\\.\\root\\someclassname");

                ManagementObject objDevice = someClass.CreateInstance();

                // set device properties

                objDevice["Name"] = "sample1.example.com";

                objDevice["Description"] = "Sample device";

                // create device instance


                return "success";


            catch(Exception ex)


                return ex.ToString();






I run this web service with WMI on the same server with Administrator privilage and I also add user ASPNET to the Administrator group.

But the web service return the following error message:
Access denied at System.Management.ManagementException.ThrowWithExt endedInfo(ManagementStat atus errorCode) System.Management.ManagementObject.Put(PutOptions options) at System.Management.ManagementObject.Put() at MyTest()

Does anyone know what's wrong with the code?

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Old July 22nd, 2003, 11:58 PM
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You can follow the steps below although I am not sure if this is the only thing that needs to get done. If you are logged into the machine where you are trying to use WMI:

1. Go to Programs -> Admin Tools -> Computer Management, then expand the Services and Applications tree node.

2. Right-click WMI Control and click Properties.

3. Go to the Advanced tab and add the ASPNET username with at least Read permissions.

Hope this helps....

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