Fix .NET 4 SocketPermission for MySQL driver in Medium Trust

Marthijn — Thu, 14 Apr 2011 18:57:38 +0000

Most .NET 4 shared hosting providers offering their customers a medium trust environment. This is not a problem for most web applications unless the applications uses MySQL in combination with the .NET MySQL driver (MySQL.Data.dll). The MySQL driver connects to the MySQL database using a socket. However, sockets are not allowed in medium trust. The application will throw a SecurityException with the following message:

Request for the permission of type 'System.Net.SocketPermission,  System, Version=4.0.0.0, Culture=neutral,  PublicKeyToken=b77a5c561934e089' failed.

In order to fix this there are three solutions:

1. Instead of MySQL, use Microsoft SQL server.

2. Move to a hosting provider that supports a full trust environment or get your own server.

3. Ask your hosting provider to update the medium trust policy with SocketPermission. The steps will be explained here:

Open the following file in a text editor:

C:\Windows\Microsoft.NET\Framework\v4.0.30319\Config\web_mediumtrust.config

Or when you are running 64 bit:

C:\Windows\Microsoft.NET\Framework64\v4.0.30319\Config\web_mediumtrust.config

Inside the SecurityClasses tag, add the following line:

Scroll down and look for the following PermissionSet:

Add the following inside this PermissionSet:

That’s all, a restart of IIS is, as far as I know, not necessary.

Using NUnit in Visual Studio 2010

Marthijn — Wed, 09 Jun 2010 12:13:10 +0000

Like in older versions of Visual Studio it is possible to use NUnit as an external tool in the new 2010 version. By creating a toolbar as well it is very easy to run your test suite. The usual way to add an external command is by clicking the menu Tools -> External Tools. However, by default this menu item is not visible. To enable this menu item go to Tools -> Settings -> Expert Settings.

The first step is download and install the latest version of NUnit since older versions are not compatible with .NET 4. NUnit version 2.5.5 can be downloaded here.

Now go to Tools -> External Tools:

I think this screen shot explains itself very well. Now its possible to add this external command to a tool bar. To do so go to View -> Toolbars -> Customize:

Press the New button and enter a name. Now open the Commands tab and add the external command (usually External Command 1 when you don’t have any other external commands) to the toolbar:

When clicking the NUnit button in the new toolbar the NUnit GUI starts and loads your test suite.

marthijn. » .NET 4.0

Fix .NET 4 SocketPermission for MySQL driver in Medium Trust

Using NUnit in Visual Studio 2010