The Program in C# Program to calculate Square Root of Given number is given below:

using System;

namespace SquareRootCalculator
{
    class Program
    {
        static void Main(string[] args)
        {
            Console.WriteLine("Hello Codeauri Family, enter a number here to find its square root:");
            double number = Convert.ToDouble(Console.ReadLine());
            double squareRoot = Math.Sqrt(number);
            Console.WriteLine("Okay, the square root of " + number + " is " + squareRoot);
            Console.ReadLine();
        }
    }
}

Output:

Hello Codeauri Family, enter a number here to find its square root:
99
9
Okay, the square root of 99 is 9.9498743710662

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Here are the step by step execution of above program:

1. Using the “using System” directive to include the System namespace, which provides access to various system types such as Console and Convert classes.
2. Creating a namespace named “SquareRootCalculator” which contains the following code.
3. Defining a class named “Program” which contains the main method.
4. The main method (Main) is declared as static and takes an array of strings as argument.
5. The program displays a message asking the user to enter a number.
6. The number entered by the user is read as a string and then converted to a double-precision floating-point number using the Convert.ToDouble method.
7. The square root of the number is calculated using the Math.Sqrt method.
8. The square root is displayed along with the number entered by the user.
9. The program waits for the user to press the enter key using Console.ReadLine.