C# class name problem

Question

If I use Math as a class name return should be System.Math.Sqrt(num); in order to program to give output.
If I am not using Math as a class name return can be Math.Sqrt(num); in order to program to give output.
Please explain
using System;
public class Math
{
public static void Main()
{
double sqrt, number;
string sNum;
Console.Write("Number = ");
sNum = Console.ReadLine();
number = Convert.ToDouble(sNum);
sqrt = SqrtRoot(number);
Console.WriteLine("Square Root of the number = {0}", sqrt);
}
public static double SqrtRoot( double num)
{
return System.Math.Sqrt(num);
}
}
/*
Number = 81
Square Root of the number = 9
Press any key to continue
*/

Answer

Thank you for your help Mike
Maha

Mike Gold · Answer

You probably don't want to use Math as a class name because it is already being used by .NET as a class.  Consider changing the class to MyMathExample