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>

    /// Function to convert Binary number to Decimal.

    /// </summary>

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

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

    public static long BinaryToDecimal(string binValue)

    {

        long decVal = 0;

        long baseVal = 1;

        long rem;

        long binVal = 0;

​

        bool isParseError = false;

​

        try

        {

            binVal = long.Parse(binValue);

        }

        catch(Exception ex)

        {

            //Possibily ArgumentNullException, OverflowException, FormatException

            isParseError = true;

            decVal = -1;

        }

​

        if (!isParseError)

        {

            //Convert Binary to Decimal.

            while (binVal > 0)

            {

                rem = binVal % 10;

                decVal = decVal + rem * baseVal;

                binVal = binVal / 10;

                baseVal = baseVal * 2;

            }

        }

​

        return decVal;

    }

}