using System;

public class Program

{

    public static void Main()

    {

         string sBinVal = "11000110";

        //Call the function to convert binary to decimal in C#.

        long decVal = BinaryToDecimal(sBinVal);

​

        if(decVal != -1)

        {

            Console.WriteLine("Binary Number: " + sBinVal);

            Console.WriteLine("Decimal: " + decVal);

        }

        else

        {

            Console.WriteLine("Input is invalid");

        }

    }

    /// <summary>

        /// Convert Binary into Decimal using Math function in C#.

        /// </summary>

        /// <param name="binValue">The binary value in string</param>

        /// <returns>The decimal value</returns>

        public static int BinaryToDecimal(string binValue)

        {

            char[] array = binValue.ToCharArray();

​

            // Reverse since 16-8-4-2-1 not 1-2-4-8-16. 

            Array.Reverse(array);

            /*

             * [0] = 1

             * [1] = 2

             * [2] = 4

             * etc

             */

            int decVal = 0;

​

            for (int i = 0; i < array.Length; i++)

            {

                if (array[i] == '1')

                {

                    // Method uses raising 2 to the power of the index. 

                    if (i == 0)

                    {

                        decVal += 1;

                    }

                    else

                    {

                        decVal += (int)Math.Pow(2, i);

                    }

                }

​

            }

​

            return decVal;

        }

}