using System;

public class Program

{

    public static void Main()

    {

        var n1 = UInt16.Parse("9B2C", System.Globalization.NumberStyles.HexNumber);

        var n2 = UInt16.Parse("7C4B", System.Globalization.NumberStyles.HexNumber);

        var n3 = UInt32.Parse("9B2C7C4B", System.Globalization.NumberStyles.HexNumber);

        var b1 = BitConverter.GetBytes(n1);

        var b2 = BitConverter.GetBytes(n2);

        var b3 = new byte[4];

        b1.CopyTo(b3, 2);

        b2.CopyTo(b3, 0);

        var n4 = BitConverter.ToUInt32(b3, 0);

        var n5 = (UInt32)(n1 << 16) + n2;

        var n6 = (UInt32)(n1 * (UInt16.MaxValue + 1)) + n2;

        Console.WriteLine($"n1: {n1}");

        Console.WriteLine($"n2: {n2}");

        Console.WriteLine($"n3: {n3}");

        Console.WriteLine($"n4: {n4}");

        Console.WriteLine($"n5: {n5}");

        Console.WriteLine($"n6: {n6}");

    }

}