Remove or replace catch blocks that handle SystemException

[rpetrusha]

Remove or replace catch blocks that handle SystemException

See #4870 on the use of Exception in catch blocks.
See #6270** on the use of ApplicationException in catch blocks.

The handling of SystemException is particularly widespread in legacy code (that is, examples written for .NET Framework 1.0, 1.1, and 2.0 that have not been revised subsequently). The problems are:

• Exception handling with SystemException may be used when no exception handling is needed.
• Exception handling with SystemException is used instead of handling more specific exceptions. As a general rule, catching SystemException rather than more derived exceptions is not recommended.

To address the issue of incorrect exception handling:

1. Work in the dotnet/samples repo.
2. Find the line of code that handles SystemException.
3. Determine whether exception handling is needed at all. If not, simply delete the try statement and the catch block.
4. Identify the methods in the try block that are candidates for throwing an exception derived from SystemException, and replace that particular catch statement with one or more catch statements that handle the appropriate exception.

[rpetrusha]

The following are C# code examples that handle SystemException. In almost all cases, there is a parallel Visual Basic example in the corresponding snippets/visualbasic directory, and in some cases, there is a parallel C++ example in the corresponding snippets/cpp directory.

• snippets\csharp\VS_Snippets_CLR\Process_GetProcessesByName2_2\CS\process_getprocessesbyname2_2.cs
• snippets\csharp\VS_Snippets_CLR\Process_StandardError\CS\source.cs
• snippets\csharp\VS_Snippets_CLR_System\system.Security.Permissions.UIPermission\CS\uipermission.cs
• snippets\csharp\VS_Snippets_CLR_System\system.Security.Permissions.UrlIdentityPermission\CS\urlidentity.cs
• snippets\csharp\VS_Snippets_CLR_System\system.Security.Permissions.ZoneIdentityPermission\CS\zoneidentity.cs
• snippets\csharp\VS_Snippets_Winforms\ContainerExmpl\CS\librarycontainer.cs