using System;

​

using System.Text.RegularExpressions;

using System.Globalization;

public class Program

{

    public static void Main()

    {

        string amount = "(123,456.78)";

        //var x = CleanInput(amount);

        double d = double.Parse("(1,000.90)", NumberStyles.AllowParentheses | 

                                      NumberStyles.AllowThousands | 

                                      NumberStyles.AllowDecimalPoint);

        Console.WriteLine(d);

    }

    public static string CleanInput(string strIn)

    {

        // Replace invalid characters with empty strings.

        return Regex.Replace(strIn, @"[^\w\.,@-]", " ");

    }

}

​

​

​

​

​