.NET C# Global Collision Operator

global:: the “global” namespace — It forces the compiler to look for a global type name without considering any other using directives(namespace).

Example:

using static System.Console;


class SampleClass
{
    public void ShowMessage()
    {
        WriteLine($"Global scope class: {nameof(SampleClass)}");
    }
}

namespace ConsoleApplication1
{
    public class SampleClass
    {
        public void ShowMessage()
        {
            WriteLine($"Namespace scope class: {nameof(SampleClass)}");
        }
    }

    class Program
    {       
        static void Main(string[] args)
        {
            global::SampleClass sampleClassGlobal = new global::SampleClass();
            sampleClassGlobal.ShowMessage();

            SampleClass sampleClass = new SampleClass();
            sampleClass.ShowMessage();
        }
      }

Output

In essence, this is a method to prevent naming conflicts. You’re likely to encounter it in code generated by tools, especially when the tool lacks awareness of all the other types within the system.