Increase file upload limit in Sharepoint 2007/2010/2013 Document library list

                 When  you are trying to upload files into sharepoint document library list, it crash down because you exceeds the file size limit. You may encounter the following error messages

• "An unexpected error has occurred"
• "The page cannot be displayed”
• "An unknown error occurred"
• "HTTP 404 – Page Not Found”
• “Request timed Out’

Solution for  the above issues are

1.    Increase the Sharepoint site file upload limit through Central administration.

    Steps are

   a. Open central admin

   b. Open Application Management Tab

   c. Select Web application general Settings

   d. Change the Maximum Upload  value with the desired value in MB( e.g 250)

   e. Ok

Now the sharepoint site is ready for accepting the desired file size.

2.   Increase the IIS connection time out length

      If you not increase the IIS connection timeout, there is a chance of connection time out of site when you are trying to upload bigger files into your Document Library . The standard time out value is 120. You can change it as the max time out value ie 6600

     Steps are

   a. Open IIS 

   b. Select Sites

   c.  Right click the sharepoint site open advanced Settings

    On Advanced Settings Tab under connection Limits change the Connection time out (Seconds) value. For setting maximum time out value enter 6600.

3. Add  httpRuntime Execution time-out in the web application- web.config file.

   Browse to the web application's virtual directory and edit the web.config file

         C:\inetpub\wwwroot\wss\VirtualDirectories\

 <httpRuntime executionTimeout="1048576" maxRequestLength="216000" />

Increase the IIS request length to maximum level. ie increase the maxAllowedcontentlength

Ru this command on the machine you are running the IIS

%windir%\system32\inetsrv\appcmd set config -section:requestFiltering -requestLimits.maxAllowedContentLength:209715200 

These are the all settings you need to set for increasing the file upload limit in Sharepoint Document Library

The Name 'SpSecurity' Does Not Exist In the current context in Sharepoint 2013

   In some cases the SPSecurity name does not  exist in the current context either in Event Handler  r webpart. That is because of  SPSecurity class is not available in sandboxed solutions. It is available in farm solutions.

When you deployed a event handler as sandboxed solution you will see an error that " The name SPsecurity doesnot exist in the current context."

                   So if you deploy the event handler as a farm solution SHAREPOINT you will see that SPSecurity class is available in the current context.