C # "Math" Program modified according to suggestion

Question

I modified C# "Math" Program  according to suggestion but it is not working. Please correct it.

If one entered a number, squre root of that number should be the output. That means for example: If I entered 10 as a input, output should be 3.1622.
 
square root of 10 = 3.1622.

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)

{

double sRoot;

sRoot = Math.Sqrt(num);

return sRoot;

}

}