convert multi variable from string to decimal in c#.net in asp.net threw an exception of type 'System.FormatException'

Question

i have 2 or maybe more than 2 string variable like below

string a = csvalue[7].Replace(" ", ""); //a="‏120641"
string b = csvalue[9].Replace(" ", "") ;//b="‏"221707‏‏‏‏
decimal result = Convert.ToDecimal(a) + Convert.ToDecimal(b)

but it have exception:" threw an exception of type 'System.FormatException'"

i try

       enter code here 
       string one = "‏120641‏‏‏‏";
        string two = "‏221707‏‏‏‏";
        string three = "123548";
       
        Double iOne = 0;
        Double iTwo = 0;
        Double ithree = 0;

        Double.TryParse(one, out iOne);
        Double.TryParse(two, out iTwo);
        Double.TryParse(three, out ithree);

and it dosent work for iOne,iTwo please help me

Answer 1

There are some (invisible) unicode chars which are not digits, so cannot be parsed. You could remove them for example with Linq and char.IsDigit :

using System;
using System.Linq;
                    
public class Program
{
    public static void Main()
    {
        string one = "‏120641‏‏‏‏";
        string two = "‏221707‏‏‏‏";
        string three = "123548";
        one = new string(one.Where(char.IsDigit).ToArray());
        two = new string(two.Where(char.IsDigit).ToArray());
        three = new string(three.Where(char.IsDigit).ToArray());
       
        Double iOne = 0;
        Double iTwo = 0;
        Double ithree = 0;

        Double.TryParse(one, out iOne);
        Double.TryParse(two, out iTwo);
        Double.TryParse(three, out ithree);
        Console.WriteLine(iOne);
        Console.WriteLine(iTwo);
        Console.WriteLine(ithree);
    }
}

.Net Fiddle