What is csc.exe?

The .exe extension on a filename indicates an executable file. Executable files may, in some cases, harm your computer. Therefore, please read below to decide for yourself whether the csc.exe on your computer is a Trojan that you should remove, or whether it is a file belonging to the Windows operating system or to a trusted application.

Click to Run a Free Scan for csc.exe related errors

Csc.exe file information

Windows Task Manager with csc
Csc.exe process in Windows Task Manager

The process known as Visual C# Command Line Compiler or HowbaniSoft Internet Cafe System Client or Comodo System Cleaner

belongs to software HowbaniSoft Internet Cafe System Client or Microsoft Visual Studio .NET or Microsoft Visual Studio (version 2005) or Microsoft .NET Framework (version 4 Client Profile) or Comodo System Cleaner

by Microsoft ( or HowbaniSoft Team - Yemen or Comodo Security Solutions (

Description: Csc.exe is not essential for the Windows OS and causes relatively few problems. The csc.exe file is located in a subfolder of C:\Windows. Known file sizes on Windows 10/8/7/XP are 1,972,552 bytes (33% of all occurrences), 49,152 bytes, 77,888 bytes or 80,376 bytes. 
The program is not visible. The csc.exe file is not a Windows core file. The process can be removed using the Control Panel's Add\Remove programs applet. It is digitally signed. Therefore the technical security rating is 21% dangerous; however you should also read the user reviews.

Uninstalling this variant: If you want to remove the program completely, go to Control Panel ⇒ Software ⇒ Microsoft .NET Framework or Microsoft .NET Framework 4 Client Profile.

Recommended: Identify csc.exe related errors

External information from Paul Collins:

Important: Some malware camouflages itself as csc.exe, particularly when located in the C:\Windows or C:\Windows\System32 folder, for example WS.Reputation.1 (detected by Symantec), and Trojan:Win32/Comitsproc (detected by Microsoft). Therefore, you should check the csc.exe process on your PC to see if it is a threat. We recommend Security Task Manager for verifying your computer's security. This was one of the Top Download Picks of The Washington Post and PC World.


User Comments

It's CA Internet Security Center
Hi, I have developed a problem on my lap top.This pop up window keeps comming onto my screen asking toallow this csc.exe file and even though I do not allow and ask tha this should not be shown again, it still keeps popping up.Is ths a virus.
"csc" stands for "C# Compiler" and is used to build C# applications for the .NET Framework by Microsoft. It is definitively not harmful.
  Niklas   (further information)
This is the Microsoft.NET C# compiler - an important part of the .NET Framework
  James Uppington   (further information)
c sharp compiler
  IB Khayman   (further information)
C# Comand Line Compiler
As a part of Visual Studio.NET it is the command line compiler for C# code. It is necesarry for program developers that makes programs coding in C#. It is only used on-demand when compiling a program or assembly, and should never run unexpectedly in background.
  awe   (further information)
It's the Visual C# compiler. I really don't understand how people can rate this as dangerous?!
Read documentation people.
  N/A   (further information)
error loading after blue screen, error code c000021a
  Ben   (further information)
It's the C# (Pronounced "C Sharp") complier. It's an imporntant part of Windows and .NET Framework. It is not harmful.
C# compiler, I don't know what it does compile though... In my case, it's running and I'm not compiling C# applications so it doesn't justify itself... I think it's safe though, because I haven't had a virus in a year now and I have a very stable and clean system.
its in docs and settings. also csc.exe.tmp and mafodirts. webroot says it kills it doesn't.
c# compiler
It isn't CA Internet Security Center. This is nonsense. csc.exe is the c# compiler inside the .net framework. Like the other guys here said.
  frank2504   (further information)
c# compiler

Rating chart

Summary: Average user rating of csc.exe: based on 31 votes with 16 user comments. 19 users think csc.exe is essential for Windows or an installed application. One user thinks it's probably harmless. 5 users think it's neither essential nor dangerous. 4 users suspect danger. 2 users think csc.exe is dangerous and recommend removing it. One user is not sure about it.

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Best practices for resolving csc issues

A clean and tidy computer is the key requirement for avoiding problems with csc. This means running a scan for malware, cleaning your hard drive using 1cleanmgr and 2sfc /scannow, 3uninstalling programs that you no longer need, checking for Autostart programs (using 4msconfig) and enabling Windows' 5Automatic Update. Always remember to perform periodic backups, or at least to set restore points.

Should you experience an actual problem, try to recall the last thing you did, or the last thing you installed before the problem appeared for the first time. Use the 6resmon command to identify the processes that are causing your problem. Even for serious problems, rather than reinstalling Windows, you are better off repairing of your installation or, for Windows 8 and later versions, executing the 7DISM.exe /Online /Cleanup-image /Restorehealth command. This allows you to repair the operating system without losing data.

To help you analyze the csc.exe process on your computer, the following programs have proven to be helpful: ASecurity Task Manager displays all running Windows tasks, including embedded hidden processes, such as keyboard and browser monitoring or Autostart entries. A unique security risk rating indicates the likelihood of the process being potential spyware, malware or a Trojan. BMalwarebytes Anti-Malware detects and removes sleeping spyware, adware, Trojans, keyloggers, malware and trackers from your hard drive.

Other processes

csc.exe [all]