C# - führende Leerzeichen mehrzeiliger Strings gleichmäßig entfernen

using System;
using System.IO;
using System.Text;
using System.Text.RegularExpressions;


namespace WhitespaceRemover
{
    class Program
    {
        static void Main(string[] args)
        {
            WhitespaceRemover.ProcessFile(args[0]);
        }
    }


    public static class WhitespaceRemover
    {
        private static string pattern = "^\\s{0}(.*?)$";
        
        /// <summary>
        /// reads a textfile and writes the processed content back to a new textfile
        /// </summary>
        /// <param name="file"></param>
        public static void ProcessFile(string file)
        {
            //probably not the most beautiful way for getting the filename but it works :)
            var newfile = string.Format("{0}\\removedWhitespaces.txt",file.Substring(0, file.LastIndexOf('\\')));

            //call the processing method and write the processed content to the new file.
            using (var swr = new StreamWriter(newfile))
            {
                swr.Write(ProcessString(File.ReadAllText(file)));
            }           
        }

        /// <summary>
        /// removes an equal number of whitespaces on each line of a multiline string, taking the first line as reference
        /// </summary>
        /// <param name="text"></param>
        /// <returns></returns>
        public static string ProcessString(string text)
        {
            //splits the multiline string into an array.
            //TODO: checking for other new line characters than the ones used in the current environment
            var textLines = text.Split(new string[] { Environment.NewLine }, StringSplitOptions.None);
            
            //split the first line into a character array and loop through it as long there are blanks and count them
            var characters = textLines[0].ToCharArray();
            var count = 0;
            while (characters[count] == ' ')
            {
                count++;
            }
            
            //put the string back together line by line
            //alternative: use the original string in text and do a regex on it
            StringBuilder sb = new StringBuilder();

            foreach(var line in textLines)
            {
                sb.AppendLine(Regex.Replace(line, string.Format(pattern, string.Concat(new string[]{"{",count.ToString(),"}"})), "$1"));
            }

            return sb.ToString();
        }
    }
}