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The global keyword is useful in some contexts to resolve ambiguity between identifiers. If you have a conflict between a class name and a namespace, for example, you can use the global keyword to access the namespace:

namespace MyApp
{
    public static class System
    {
        public static void Main()
        {
            global::System.Console.WriteLine("Hello, World!");
            // if we had just used System.Console.WriteLine, 
            // the compile would think that we referred to a 
            // class named "Console" inside our "System" class.
        }
    }
}

global does not work in the following situation, however, as our System class does not have a namespace:

public static class System
{
    public static void Main()
    {
        global::System.Console.WriteLine("Hello, World!");
        // "System" doesn't have a namespace, so the above
        // would be referring to this class!
    }
}



C# Keywords
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byte case catch char checked
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fixed float for foreach goto
if implicit in int interface
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Special C# Identifiers (Contextual Keywords)
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get global nameof partial remove
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