GetEnvironmentVariable() and SetEnvironmentVariable() for PATH Variable

Question

I want to extend the current PATH variable with a C# program. Here I have several problems:

1. Using GetEnvironmentVariable(\"PATH\", EnvironmentVariable

Answer 1

You can use WMI to retrieve the raw values (not sure about updating them though):

ManagementObjectSearcher searcher = new ManagementObjectSearcher("select * from Win32_Environment WHERE Name = 'PATH'");
foreach (ManagementBaseObject managementBaseObject in searcher.Get())
     Console.WriteLine(managementBaseObject["VariableValue"]);

Check WMI Reference on MSDN