syntax for converting bytes to megabytes and gigabytes c# .Net

This should do it. Note that I've set the accuracy to one decimal place:

using System;

class Program
{
     static void Main()
     {
         string bytesString = "2145374208";
         Console.WriteLine("{0} bytes",bytesString);
         ulong  bytes = UInt64.Parse(bytesString);
         string mb = ConvertToMegabytes(bytes);
         string gb = ConvertToGigabytes(bytes);
        
         Console.WriteLine("equals {0}", mb);
         Console.WriteLine("equals {0}", gb);
         Console.ReadLine();
     }

     static string ConvertToMegabytes(ulong bytes)
     {
        return ((decimal)bytes/1024M/1024M).ToString("F1") +"MB";
     }

     static string ConvertToGigabytes(ulong bytes)
     {
        return ((decimal)bytes/1024M/1024M/1024M).ToString("F1") +"GB";
     } 
 
}