What does question mark and dot operator ?. mean in C# 6.0? | C# Online Compiler

What does question mark and dot operator ?. mean in C# 6.0? by Anonymous

using System;
					
public class Program
{
	public static void Main()
	{
		var county = "145627.0";

		Console.WriteLine("The : {0}", Convert.ToDouble(county).ToString());
	}
	
	
}

​x
 
using System;
                    
public class Program
{
    public static void Main()
    {
        var county = "145627.0";
​
        Console.WriteLine("The : {0}", Convert.ToDouble(county).ToString());
    }
    
    
}
​

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