using System;

public class Program

{

        [Serializable]

        public enum SanitizationMode

        {

            Escape = 0,

            Remove = 1,

            None = 2

        }

        private static char Escape { get; } = '"';

​

        private static char Quote { get;  } = '"';

​

        private static char Comma { get; } = ',';

​

        private static char DataLinkEscape { get; } = (char)16;

​

        private static string EscapeString { get; } = new string(new char[] { DataLinkEscape, Comma });

​

        private static char[] InjectionCharacters { get; set; } = new[] { '=', '@', '+', '-', '|' };

​

        private static char InjectionEscapeCharacter { get; } = '\'';

    public static void Main()

    {

        string temp= "-123.45";

        Console.WriteLine(SanitizeString(temp, SanitizationMode.Remove));

    }

​

     public static string SanitizeString(string field, SanitizationMode sanitizationMode)

        {

            if (sanitizationMode != SanitizationMode.None)

            {

                int position = 0;

                if (string.IsNullOrEmpty(field))

                {

                    return field;

                }

​

                if ((position = field.IndexOfAny(InjectionCharacters)) >= 0)

                {

                    if (!IsNumeric(field))

                    {

                        return string.Empty;

                    }

                }

            }

​

            if (!string.IsNullOrWhiteSpace(field))

            {

                field = field.Replace(EscapeString, Comma.ToString());

            }

            return field;

        }

            private static bool IsNumeric(string inputData)

        {

            bool returnValue = false;

            decimal tempValue;

            if (!(string.IsNullOrEmpty(inputData) || string.IsNullOrWhiteSpace(inputData)))

            {

                returnValue = decimal.TryParse(inputData, out tempValue);

            }

​

            return returnValue;

        }

}