Convert string to int, C#

Convert string to int

//Rextester.Program.Main is the entry point for your code. Don't change it.
//Compiler version 4.0.30319.17929 for Microsoft (R) .NET Framework 4.5

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text.RegularExpressions;

namespace Rextester
{
    public class Program
    {
        public static void Main(string[] args)
        {
            var strNumber = "123456789";
            
            //Your code goes here
            var result = ConvertStringToInt(strNumber, 10);
            Console.WriteLine(result);
        }
        
        public static int ConvertStringToInt(string str, int baseNumber){
            var len = str.Length;
            var result = 0;
            for(var i = 0; i < len; i++){
                result += ConvertCharToInt(str[i]) * (int)Math.Pow(baseNumber, len - i - 1);
            }
            
            return result;
        }
        
        public static int ConvertCharToInt(char ch){
            return (int)ch - 0x30;
        }
    }
}


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