using System;
public class clsAsin
{
 
    public void Main()
    {
 
 
        //********************************************************************************
        // Purpose: takes a double data type number that represents a sine and 
        // returns a double value that represents the angle of that sine when
        // measured in radians. (you can convert the radians to degrees by 
        // multiplying them by Math.PI/180) 
        // 
        // Syntax: 	Asin(double)
        //
        // Parameter1: double - The expression represents a sine that is 
        // to be converted into radians of an angle. Any 
        // valid System.Double data type number between -1 and +1 
        // if number < -1 or > 1, NaN is returned - NaN stands for Not a Number
        //
        // Result: double - represents the radians of the angle of the sine 
        // that was specified as the input parameter.
        //
        // Quick Example: Asin(0.5) // Returns .523598775598299
        //
        //
        //********************************************************************************
        // This example is from http://idealprogrammer.com
 
        Console.WriteLine("Example #1: 	Asin(90)");
 
        Console.WriteLine(Math.Asin(90)); // Returns NaN
 
        //write blank line to make output easier to read
        Console.WriteLine();
 
        Console.WriteLine("Example #2: 	Asin(-3.4)");
 
        Console.WriteLine(Math.Asin(-3.4)); // Returns NaN
        //write blank line to make output easier to read
        Console.WriteLine();
 
        Console.WriteLine("Example #3: 	Asin(0.5)");
 
 
 
        Console.WriteLine(Math.Asin(0.5)); // Returns .523598775598299
 
        //Prevent console from closing before you press enter
        Console.ReadLine();
 
    }
 
}

Module Module1
 
    Sub Main()
 
 
        Dim myclsAsin As New clsAsin
        myclsAsin.Main()
 
 
 
    End Sub
 
End Module