gistfile1.txt

struct MyStruct
{
	public int MyValue { get; set; }
 
	public void UpdateMyValue(int value)
	{
		MyValue = value;
	}
}
 
class Program
{
	static void Main(string[] args)
	{
		MyStruct myStruct = new MyStruct();
		myStruct.UpdateMyValue(1);
		UpdateMyValue(myStruct);
		Console.WriteLine(myStruct.MyValue);
		Console.ReadLine();
	}
 
	static void UpdateMyValue(in MyStruct myStruct)
	{
		myStruct.UpdateMyValue(5);
	}
}

from : https://dotnetcoretutorials.com/2018/01/08/new-keyword-c-7-2/