windows temp .out files filling up with csc logs

Hi All,

We are running a .net web API with data contracts on IIS on windows server 2008.

We noticed that C:\windows\temp folder was filling up with many .out files. We have 2 million of these accumulated over years. After cleanup, it generated 6000 more within 2 hours which is quite less than the count of requests processed.

All of them seem to have the output of csc.exe. I'm trying to understand what causes this compilation and if there is a way to stop it from generating these .out files.

I am putting the sample output.

<div>c:\windows\system32\inetsrv> "C:\Windows\Microsoft.NET\Framework64\v4.0.30319\csc.exe" /t:library /utf8output /R:"C:\Windows\Microsoft.NET\Framework64\v4.0.30319\mscorlib.dll" /R:"C:\Windows\Microsoft.Net\assembly\GAC_64\System.Web\v4.0_4.0.0.0__b03f5f7f11d50a3a\System.Web.dll" /R:"C:\Windows\Microsoft.Net\assembly\GAC_MSIL\System\v4.0_4.0.0.0__b77a5c561934e089\System.dll" /R:"C:\Windows\Microsoft.Net\assembly\GAC_MSIL\System.Core\v4.0_4.0.0.0__b77a5c561934e089\System.Core.dll" /R:"C:\Windows\Microsoft.Net\assembly\GAC_MSIL\System.Web.ApplicationServices\v4.0_4.0.0.0__31bf3856ad364e35\System.Web.ApplicationServices.dll" /R:"C:\Windows\Microsoft.Net\assembly\GAC_MSIL\System.Configuration\v4.0_4.0.0.0__b03f5f7f11d50a3a\System.Configuration.dll" /R:"C:\Windows\Microsoft.Net\assembly\GAC_MSIL\System.Xml\v4.0_4.0.0.0__b77a5c561934e089\System.Xml.dll" /R:"C:\Windows\Microsoft.Net\assembly\GAC_MSIL\System.Runtime.Caching\v4.0_4.0.0.0__b03f5f7f11d50a3a\System.Runtime.Caching.dll" /R:"C:\Windows\Microsoft.Net\assembly\GAC_MSIL\Microsoft.Build.Utilities.v4.0\v4.0_4.0.0.0__b03f5f7f11d50a3a\Microsoft.Build.Utilities.v4.0.dll" /R:"C:\Windows\Microsoft.Net\assembly\GAC_MSIL\Microsoft.JScript\v4.0_10.0.0.0__b03f5f7f11d50a3a\Microsoft.JScript.dll" /R:"C:\Windows\Microsoft.NET\Framework64\v4.0.30319\Temporary ASP.NET Files\root\5ed33af1\7c33681b\assembly\dl3\d1b4d7fb\0020d617_f4bfd201\System.Web.WebPages.dll" /R:"C:\Windows\Microsoft.NET\Framework64\v4.0.30319\Temporary ASP.NET Files\root\5ed33af1\7c33681b\assembly\dl3\e01cb87e\0020d617_f4bfd201\System.Web.WebPages.Deployment.dll" /R:"C:\Windows\Microsoft.NET\Framework64\v4.0.30319\Temporary ASP.NET Files\root\5ed33af1\7c33681b\assembly\dl3\683b60e2\0020d617_f4bfd201\System.Web.WebPages.Razor.dll" /R:"C:\Windows\Microsoft.NET\Framework64\v4.0.30319\Temporary ASP.NET Files\root\5ed33af1\7c33681b\assembly\dl3\822be408\0020d617_f4bfd201\System.Web.Mvc.dll" /R:"C:\Windows\Microsoft.NET\Framework64\v4.0.30319\Temporary ASP.NET Files\root\5ed33af1\7c33681b\assembly\dl3\a11f930b\00994214_f4bfd201\Microsoft.Web.Infrastructure.dll" /R:"C:\Windows\Microsoft.NET\Framework64\v4.0.30319\Temporary ASP.NET Files\root\5ed33af1\7c33681b\App_global.asax.s-zsmr7l.dll" /R:"C:\Windows\Microsoft.NET\Framework64\v4.0.30319\Temporary ASP.NET Files\root\5ed33af1\7c33681b\assembly\dl3\6322fa0c\00f3a416_f4bfd201\Registry.WebApi.dll" /R:"C:\Windows\Microsoft.NET\Framework64\v4.0.30319\Temporary ASP.NET Files\root\5ed33af1\7c33681b\assembly\dl3\42bab9bc\00c67315_f4bfd201\Registry.Logging.dll" /R:"C:\Windows\Microsoft.NET\Framework64\v4.0.30319\Temporary ASP.NET Files\root\5ed33af1\7c33681b\assembly\dl3\aabd9e6d\006c1113_f4bfd201\log4net.dll" /R:"C:\Windows\Microsoft.NET\Framework64\v4.0.30319\Temporary ASP.NET Files\root\5ed33af1\7c33681b\assembly\dl3\06537ea2\00994214_f4bfd201\Registry.EPPCore.dll" /R:"C:\Windows\Microsoft.Net\assembly\GAC_MSIL\System.ServiceModel.Activation\v4.0_4.0.0.0__31bf3856ad364e35\System.ServiceModel.Activation.dll" /R:"C:\Windows\Microsoft.Net\assembly\GAC_MSIL\System.Web.Extensions\v4.0_4.0.0.0__31bf3856ad364e35\System.Web.Extensions.dll" /R:"C:\Windows\Microsoft.NET\Framework64\v4.0.30319\Temporary ASP.NET Files\root\5ed33af1\7c33681b\assembly\dl3\be392935\006c1113_f4bfd201\Elmah.dll" /R:"C:\Windows\Microsoft.NET\Framework64\v4.0.30319\Temporary ASP.NET Files\root\5ed33af1\7c33681b\assembly\dl3\bd61b1b8\00c67315_f4bfd201\Registry.Utility.dll" /R:"C:\Windows\Microsoft.NET\Framework64\v4.0.30319\Temporary ASP.NET Files\root\5ed33af1\7c33681b\assembly\dl3\6d79b69b\00994214_f4bfd201\Registry.Contracts.dll" /R:"C:\Windows\Microsoft.NET\Framework64\v4.0.30319\Temporary ASP.NET Files\root\5ed33af1\7c33681b\assembly\dl3\5a4977a3\00f3a416_f4bfd201\Spring.Core.dll" /R:"C:\Windows\Microsoft.NET\Framework64\v4.0.30319\Temporary ASP.NET Files\root\5ed33af1\7c33681b\assembly\dl3\7607d8ae\006c1113_f4bfd201\Common.Logging.dll" /R:"C:\Windows\Microsoft.NET\Framework64\v4.0.30319\Temporary ASP.NET Files\root\5ed33af1\7c33681b\assembly\dl3\0a34653b\006c1113_f4bfd201\Common.Logging.Core.dll" /R:"C:\Windows\Microsoft.NET\Framework64\v4.0.30319\Temporary ASP.NET Files\root\5ed33af1\7c33681b\assembly\dl3\866c3b26\00c67315_f4bfd201\Registry.Redis.dll" /R:"C:\Windows\Microsoft.NET\Framework64\v4.0.30319\Temporary ASP.NET Files\root\5ed33af1\7c33681b\assembly\dl3\fb683447\00c67315_f4bfd201\Registry.Nucleus.Client.dll" /R:"C:\Windows\Microsoft.NET\Framework64\v4.0.30319\Temporary ASP.NET Files\root\5ed33af1\7c33681b\assembly\dl3\4ada7e6a\00c67315_f4bfd201\Registry.MessageQueue.MassTransit.Consumer.dll" /R:"C:\Windows\Microsoft.NET\Framework64\v4.0.30319\Temporary ASP.NET Files\root\5ed33af1\7c33681b\assembly\dl3\6666bb57\00c67315_f4bfd201\Registry.MessageQueue.MassTransit.dll" /R:"C:\Windows\Microsoft.NET\Framework64\v4.0.30319\Temporary ASP.NET Files\root\5ed33af1\7c33681b\assembly\dl3\ffa4fc9c\006c1113_f4bfd201\MassTransit.dll" /R:"C:\Windows\Microsoft.NET\Framework64\v4.0.30319\Temporary ASP.NET Files\root\5ed33af1\7c33681b\assembly\dl3\405278cc\00c67315_f4bfd201\Registry.MessageQueue.dll" /R:"C:\Windows\Microsoft.NET\Framework64\v4.0.30319\Temporary ASP.NET Files\root\5ed33af1\7c33681b\assembly\dl3\0dc574d1\00f3a416_f4bfd201\Registry.Utility.Repository.dll" /R:"C:\Windows\Microsoft.Net\assembly\GAC_64\System.Data\v4.0_4.0.0.0__b77a5c561934e089\System.Data.dll" /R:"C:\Windows\Microsoft.NET\Framework64\v4.0.30319\Temporary ASP.NET Files\root\5ed33af1\7c33681b\assembly\dl3\f5f51529\00994214_f4bfd201\Registry.Core.dll" /R:"C:\Windows\Microsoft.NET\Framework64\v4.0.30319\Temporary ASP.NET Files\root\5ed33af1\7c33681b\assembly\dl3\a4c5aed6\00c67315_f4bfd201\Registry.Persistence.dll" /R:"C:\Windows\Microsoft.NET\Framework64\v4.0.30319\Temporary ASP.NET Files\root\5ed33af1\7c33681b\assembly\dl3\7e0dbf3b\00c67315_f4bfd201\Registry.Extension.RGP.dll" /R:"C:\Windows\Microsoft.NET\Framework64\v4.0.30319\Temporary ASP.NET Files\root\5ed33af1\7c33681b\assembly\dl3\44a54773\00c67315_f4bfd201\Registry.Extension.Trademarks.dll" /R:"C:\Windows\Microsoft.NET\Framework64\v4.0.30319\Temporary ASP.NET Files\root\5ed33af1\7c33681b\assembly\dl3\29557bf2\00c67315_f4bfd201\Registry.Utility.Aux.dll" /R:"C:\Windows\Microsoft.NET\Framework64\v4.0.30319\Temporary ASP.NET Files\root\5ed33af1\7c33681b\assembly\dl3\539620bb\00c67315_f4bfd201\Registry.ReservedName.Client.dll" /R:"C:\Windows\Microsoft.NET\Framework64\v4.0.30319\Temporary ASP.NET Files\root\5ed33af1\7c33681b\assembly\dl3\deade573\00c67315_f4bfd201\Registry.Notifications.dll" /R:"C:\Windows\Microsoft.NET\Framework64\v4.0.30319\Temporary ASP.NET Files\root\5ed33af1\7c33681b\assembly\dl3\475113a8\00994214_f4bfd201\Newtonsoft.Json.dll" /R:"C:\Windows\Microsoft.NET\Framework64\v4.0.30319\Temporary ASP.NET Files\root\5ed33af1\7c33681b\assembly\dl3\455322fe\00994214_f4bfd201\Registry.Audit.dll" /R:"C:\Windows\Microsoft.NET\Framework64\v4.0.30319\Temporary ASP.NET Files\root\5ed33af1\7c33681b\assembly\dl3\4fc5b66b\00994214_f4bfd201\Registry.Caching.dll" /R:"C:\Windows\Microsoft.NET\Framework64\v4.0.30319\Temporary ASP.NET Files\root\5ed33af1\7c33681b\assembly\dl3\37e1b05c\00c67315_f4bfd201\Registry.Extension.Verification.dll" /R:"C:\Windows\Microsoft.NET\Framework64\v4.0.30319\Temporary ASP.NET Files\root\5ed33af1\7c33681b\assembly\dl3\55feceb6\00994214_f4bfd201\Registry.EPP.Serialization.dll" /R:"C:\Windows\Microsoft.NET\Framework64\v4.0.30319\Temporary ASP.NET Files\root\5ed33af1\7c33681b\assembly\dl3\85902811\00994214_f4bfd201\Registry.DnsClient.dll" /R:"C:\Windows\Microsoft.NET\Framework64\v4.0.30319\Temporary ASP.NET Files\root\5ed33af1\7c33681b\assembly\dl3\8d133dd4\00c67315_f4bfd201\Registry.Extension.Charge.dll" /R:"C:\Windows\Microsoft.NET\Framework64\v4.0.30319\Temporary ASP.NET Files\root\5ed33af1\7c33681b\assembly\dl3\807d15ac\00c67315_f4bfd201\Registry.Protocol.EPP.dll" /R:"C:\Windows\Microsoft.NET\Framework64\v4.0.30319\Temporary ASP.NET Files\root\5ed33af1\7c33681b\assembly\dl3\478c4967\00c67315_f4bfd201\Registry.Idn.dll" /R:"C:\Windows\Microsoft.NET\Framework64\v4.0.30319\Temporary ASP.NET Files\root\5ed33af1\7c33681b\assembly\dl3\36d1edb6\00c67315_f4bfd201\Registry.Extension.IDN.dll" /R:"C:\Windows\Microsoft.NET\Framework64\v4.0.30319\Temporary ASP.NET Files\root\5ed33af1\7c33681b\assembly\dl3\4639a18c\00c67315_f4bfd201\Registry.Extension.AllocationToken.dll" /R:"C:\Windows\Microsoft.NET\Framework64\v4.0.30319\