List all Environment Variables

The system variables are exposed through the GetEnvironmentVariables method in the System.Environment class.

var environmentVariables = System.Environment.GetEnvironmentVariables();
foreach (var ev in environmentVariables)
{
      DictionaryEntry de = (DictionaryEntry) ev;
      Console.WriteLine(string.Format("Key: {0}, Value: {1}", de.Key, de.Value));
      Console.WriteLine();
}