Convert Binary Number to Decimal Number in C#

Binary Number: A Number expressed using the base 2 with digits 0 and 1.

Decimal Number: A Number expressed using the base 10 with digits 0 to 9.

Conversion Example: Suppose we want to convert binary number 1011 to decimal. The followiing is the conversion process:

Step 1: 1* 2^0=1
Step 2: 1* 2^1=2
Step 3: 0*2^2=0
Step 4: 1*2^3=8

Its decimal value = 1 + 2 + 0 + 8 = 11

So (1011)_{2 =} (11)₁₀

class BinaryToDecimal {
    public int Power(int n) {
        if (n == 0) return 1;
        else return 2 * Power(n - 1);

    }
    static void Main() {
        BinaryToDecimal bd = new BinaryToDecimal();
        Console.WriteLine("Enter any binary no");
        string s1 = Console.ReadLine();
        string s2 = "";
        for (int i = s1.Length - 1; i >= 0; i--) {
            s2 += s1[i];
        }
        int sum = 0;
        for (int i = 0; i < s2.Length; i++) {
            int res = bd.Power(i);
            sum = sum + (res * int.Parse(s2[i].ToString()));
        }
        Console.WriteLine(sum);
        Console.ReadLine();
    }
}