App Suspended feature in .NET Framework 4.5.1

Today we will go through one of the new feature added in .NET framework 4.5.1. This feature is currently available only in Windows Server 2012 R2. Microsoft may add this in other operating systems later but currently this is restricted to Windows Server 2012 R2.

App Suspend is a new configuration in IIS in Windows Server 2012 R2. We will see what is the advantage we are going to get if use this configuration and also will see where we have to change this configuration.

First thing first! What is the advantage of using app suspend?

If you enable this great feature your application start up will be much faster and in single webserver server you can host multiple application without impacting the performance.

Now, lets see how enable this feature.

In order to enable first we will open IIS from your Windows Server 2012 R2. Open IIS—> Select Application Pools—> Right Click on Application Pools and then select the “Advance Settings…”.

In advanced Settings window you will not see this feature anywhere! isn’t it? Yes you cannot see this feature directly. This feature is part of the “Idle Time-out” settings.

 

You would have noticed a special configuration here that is nothing but the “Idle Time-Out Action” this is currently available only Windows Server 2012 R2. This is the configuration we have to change. By default it will be selected as “Terminate”.

 

Just click on this dropdown to see that the new option “Suspend”. and select the same and click on OK to return.

That’s all you have to do, you are done!!!

If you like to test this feature then change the default time to 2 min or something and access the application. Also change the setting back to terminate and see your application start up time difference.
I hope you understood the advantage of this App Suspend feature and you will try this in your application.

Request for the permission of type 'System.Web.AspNetHostingPermission, System, Version=2.0.0.0, Culture=neutral, PublicKeyToken=b77a5c561934e089' failed.

Recently when I was debugging my application I got the error “Request for the permission of type 'System.Web.AspNetHostingPermission, System, Version=2.0.0.0, Culture=neutral, PublicKeyToken=b77a5c561934e089' failed.”

Below is the exact error I have received.

Description: The application attempted to perform an operation not allowed by the security policy. To grant this application the required permission please contact your system administrator or change the application's trust level in the configuration file.

Exception Details: System.Security.SecurityException: Request for the permission of type 'System.Web.AspNetHostingPermission, System, Version=2.0.0.0, Culture=neutral, PublicKeyToken=b77a5c561934e089' failed.

I was very mush sure that I have proper permission in my system and also I am running Visual Studio in Administrator mode. So there is no way I should get security exception.

First thing I checked was the TRUST level in web.config but found that it was set to FullTrust. They suddenly I realized that I am running the code from remote share, I mean from the network drive.Therefore, the remote share that holds the Web applications content requires FullTrust.

There are two ways to solve this error,

1. Copy the complete code in your local drive and run, since you are an administrator to your system there won’t be any issues.

2. Provide FullTrust to your network drive. To provide FullTrust to your network drive you have to follow certain steps. This steps are already documented in Microsoft KB article. I would like you to go through this steps in case if you are interested to provide FullTrust to your network drive.

I hope you are able to resolve this issue now and you are able to debug your application without any problem.

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Server Error in '/' Application, Maximum request length exceeded

Below is one of the common error developers get when they try to upload huge files using ASP.NET application.

Error description:

Server Error in '/' Application.
--------------------------------------------------------------------------------

Maximum request length exceeded.
Description: An unhanded exception occurred during the execution of the current web request. Please review the stack trace for more information about the error and where it originated in the code.

Exception Details: System.Web.HttpException: Maximum request length exceeded.

Source Error:

An unhandled exception was generated during the execution of the current web request. Information regarding the origin and location of the exception can be identified using the exception stack trace below.

Reason:

users are trying to upload huge files which is more than the default size allowed by .NET Framework.

Solution:

Change below settings in web.config depends on the IIS version you are using.

For IIS6

<configuration>

    <system.web>

        <httpRuntime maxRequestLength="1048576" />

    </system.web>

</configuration>

For IIS7

<system.webServer>

   <security>

      <requestFiltering>

         <requestLimits maxAllowedContentLength="1073741824" />

      </requestFiltering>

   </security>

 </system.webServer>

You may change the values depends on the file size you want to allow the users to upload.

Try to run your application and upload some files!!!

Download for Internet Information Services (IIS) 8.0 Express Beta is now live

 

Happy news for the developers. Microsoft announce that download for IIS 8.0 Express Beta is now live.  You can download the same using the following URL:

http://www.microsoft.com/download/en/details.aspx?id=29055

The IIS 8.0 version of IIS Express shares more of its foundation with the full version of IIS, so you may not face much issues when you switch between your development environment and your production environment.

More details are available in the ReadMe file for IIS Express, which is can be seen at the following URL:

http://learn.iis.net/page.aspx/1266/iis-80-express-beta-readme/

Display Outage page in Asp.Net

App_offline.htm file used to display the error/notification message to the users when your site is under maintenance. if you keep this file your root directory no other files/requests will be processed.

Make a simple HTML file by writing "The application is under maintenance. Please try again later." and name it as App_offline.htm

Drop this file in your root directory of your web application folder.

After copying App_offline.htm file try to access your web application link and see the output.