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Posted 27 Jun 2011
Licenced CPOL

Enabling and Disabling TaskManager

, 27 Jun 2011
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Please note before we get started that this program must be ran as Administrator.
There are a few Ways that we can do this Check out the MSDN site for the First Method windowsimpersonationcontext. another way would be to add an Application Manifest to your project.

<?xml version="1.0" encoding="utf-8"?>
<asmv1:assembly manifestVersion="1.0" xmlns="urn:schemas-microsoft-com:asm.v1" xmlns:asmv1="urn:schemas-microsoft-com:asm.v1" xmlns:asmv2="urn:schemas-microsoft-com:asm.v2" xmlns:xsi="">
  <assemblyIdentity version="" name=""/>
  <trustInfo xmlns="urn:schemas-microsoft-com:asm.v2">
      <requestedPrivileges xmlns="urn:schemas-microsoft-com:asm.v3">
        <!-- UAC Manifest Options
            If you want to change the Windows User Account Control level replace the 
            requestedExecutionLevel node with one of the following.

        <requestedExecutionLevel  level="asInvoker" uiAccess="false" />
        <requestedExecutionLevel  level="requireAdministrator" uiAccess="false" />
        <requestedExecutionLevel  level="highestAvailable" uiAccess="false" />

            Specifying requestedExecutionLevel node will disable file and registry virtualization.
            If you want to utilize File and Registry Virtualization for backward 
            compatibility then delete the requestedExecutionLevel node.
        <requestedExecutionLevel level="requireAdministrator" uiAccess="false" />
  <compatibility xmlns="urn:schemas-microsoft-com:compatibility.v1">
      <!-- A list of all Windows versions that this application is designed to work with. Windows will automatically select the most compatible environment.-->

      <!-- If your application is designed to work with Windows 7, uncomment the following supportedOS node-->
      <!--<supportedOS Id="{35138b9a-5d96-4fbd-8e2d-a2440225f93a}"/>-->
  <!-- Enable themes for Windows common controls and dialogs (Windows XP and later) -->
  <!-- <dependency>


Now change the level asInvoker to requireAdministrator as done above on line 24 or just copy and paste this into the app.manifest file. Now that we have this done we will have two protected overrides being the OnLoad and OnClosing Events. OnLoad will Disable the TaskManager and OnClosing will Enable the TaskManager.
To Download the .reg registry scripts to do this you can get those here TaskMgrED Now to see how the code works :)
First we will have an enum that contains our TaskManager Settings and an class That will give us our RegistryKey based on whether the TaskManger is Enabled or Disabled.
you will need to add
using Microsoft.Win32;

public enum TaskManager 

As you can see our TaskManager enum is Really straight-forward. Now for the class that holds our RegistryKey

public static class RegEdit
            public static RegistryKey SetKey(TaskManager command)
                RegistryKey mKey;
                string subKey = "Software\\Microsoft\\Windows\\CurrentVersion\\Policies\\System";
                mKey = Registry.CurrentUser.CreateSubKey(subKey);
                switch (command)
                    case TaskManager.Enabled:
                        mKey.SetValue("DisableTaskMgr", 0);
                    case TaskManager.Disabled:
                        mKey.SetValue("DisableTaskMgr", 1);
                return mKey;

To Call the methods we will use OnLoad to Disable
protected override void OnLoad(EventArgs e)
            RegistryKey regkey = RegEdit.SetKey(TaskManager.Disabled);

and OnFormClosing To Enable
protected override void OnFormClosing(FormClosingEventArgs e)
            RegistryKey regkey = RegEdit.SetKey(TaskManager.Enabled);


This article, along with any associated source code and files, is licensed under The Code Project Open License (CPOL)


About the Author

charles henington
United States United States
I do not claim to be wrong! I just rarely ever write.

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Comments and Discussions

Questiongetting access denied error Pin
Mahendra Saini28-Jul-14 21:24
memberMahendra Saini28-Jul-14 21:24 
GeneralRe: Never mind.And I'm about to expect your new article.Come on!... Pin
Wei Shen27-Jun-11 15:47
memberWei Shen27-Jun-11 15:47 
GeneralRe: I have given it thought yes, able to accomplish as of this m... Pin
charles henington27-Jun-11 15:41
membercharles henington27-Jun-11 15:41 
GeneralReason for my vote of 5 OK,good article Pin
Wei Shen27-Jun-11 15:38
memberWei Shen27-Jun-11 15:38 
GeneralRe: Sorry was slow on the reply lol Pin
charles henington27-Jun-11 15:41
membercharles henington27-Jun-11 15:41 
GeneralI haven't come across anyone yet who can...Can you? If So Pl... Pin
charles henington27-Jun-11 15:32
membercharles henington27-Jun-11 15:32 
GeneralRe: Sorry,I can't.Maybe unsafe C++ code can make it.Do you ever ... Pin
Wei Shen27-Jun-11 15:36
memberWei Shen27-Jun-11 15:36 
GeneralReason for my vote of 3 This is not a good way to disable th... Pin
Wei Shen27-Jun-11 15:26
memberWei Shen27-Jun-11 15:26 

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