You receive a "System.Security.SecurityException" exception when you run an application that calls the SystemInformation.UserName property

1. In the Main procedure, replace the existing code with the following code:
   
   Visual Basic .NET or Visual Basic 2005 Code

   'display the UserName currently logged 
           Console.WriteLine(System.Environment.UserName)
           Console.ReadLine()

   Visual C# .NET Code

   //display the UserName currently logged
   			Console.WriteLine(System.Environment .UserName);
   			Console.ReadLine();

2. On the Debug menu, click Start.

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Steps to Reproduce the Behavior

1. In Microsoft Visual Studio .NET or in Microsoft Visual Studio 2005, start a new console application by using Microsoft Visual Basic or Microsoft Visual C#.
2. In Solution Explorer, right-click ConsoleApplication1, and then click Add Reference.
3. On the .NET tab, click to select System.Windows.Forms.dll, and then click Select.
4. In the code editor, add the following statement as the first line of code:
   
   Visual Basic .NET or Visual Basic 2005 Code

   Imports System.Windows.Forms

   Visual C# .NET Code

   using System.Windows.Forms;

5. Add the following code to the Main procedure:
   
   Visual Basic .NET or Visual Basic 2005 Code

   'display the UserName that is currently logged 
   Console.WriteLine(SystemInformation.UserName)

   Visual C# .NET Code

   //display the UserName that is currently logged
   Console.WriteLine(SystemInformation.UserName);

6. Click Start, point to Microsoft Visual Studio .NET, point to Visual Studio .NET Tools, and then click Visual Studio .NET Command Prompt.
   
   Note In Visual Studio 2005, click Start, point to Microsoft Visual Studio 2005, point to Visual Studio 2005 Tools, and then click Visual Studio 2005 Command Prompt.
7. Run the following statement at the command prompt:

   sn -k mykey.snk

8. In the ConsoleApplication1 Solution Explorer, double-click AssemblyInfo.vb.
9. Add the following statement to the code:
   
   Visual Basic .NET or Visual Basic 2005

   <Assembly: AssemblyKeyFile("local_file_path\mykey.snk")>

   Visual C# .NET
   
   Replace the existing statement

   [assembly: AssemblyKeyFile("")]

   with the following statement:

   [assembly: AssemblyKeyFile("local_file_path/mykey.snk")]

   Note Replace local_file_path with the path of Mykey.snk on your local computer.
10. On the Build menu, click Build Solution.
11. Click Start, point to Administrative Tools, and then click Microsoft .NET Framework Configuration.
12. In the .NET Framework Configuration window, expand Runtime Security Policy, and then expand Machine.
13. In the Machine window, expand Code Groups, and then expand All_Code.
14. Right-click LocalIntranet_Zone, and then click Properties.
15. On the General tab, click to select This policy level will only have the permissions from the permission set associated with this code group check box.
16. Click the Membership Condition tab. Under Choose the condition type for this code group, click to select Strong Name.
17. Click Import, locate the ConsoleApplication1.exe file, and then click to select the file. Click Open.
18. Click OK to apply the assigned properties.
19. In ConsoleApplication1, click Start on the Debug menu.
    
    You receive the exception mentioned in the "Symptoms" section of this article.

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