Convert a null value to null value

Hello:

I want to convert a value of a nullable type to another nullable type, in order to get a simple code avoiding to use an IF/THEN sentence.

I thought I could use the Convert class but I found out that a null is not converted to a null even when both types are nullable and can hold the null value.

In the example code below you can see how null is converted to 0 when using int?, so resulting in missing the null.

How could I achieve this?

Thanks in advance,

Juarrero

class Program
    {
        int? a;
        int? b; 
 
        static void Main(string[] args)
        {
            Program P = new Program();
 
            P.a = null;
 
            // Using Convert
            P.b = Convert.ToInt32(P.a);
            if (P.b == null) { Console.WriteLine("null"); } else { Console.WriteLine(P.b); }
 
            // Without using Convert
            P.b = P.a;
            if (P.b == null) { Console.WriteLine("null"); } else { Console.WriteLine(P.b); }
 
            Console.ReadLine();
        }
    }

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