public void HowFileSave(string path,bool append)
        {
            if (!path.ToLower().EndsWith(".csv"))
            {
                path += ".csv";
            }

            var correctPath = Directory.GetParent(path).ToString();

            Directory.CreateDirectory(correctPath);

            FileSave(path, append);
        }

        private void FileSave(string path, bool appendFile)
        {
            var files = SeparateCsvToFiles(Rows, path);

            foreach (var file in files)
            {
                try
                {
                    using (StreamWriter writer = new StreamWriter(file.Key, appendFile, Encoding.UTF8))
                    {
                        foreach (var row in file.Value)
                        {
                            writer.WriteLine(BuildCsvRow(row));
                        }
                    }
                }
                catch (Exception) { }

            }
        }

        private List<KeyValuePair<string, List<List<string>>>> SeparateCsvToFiles(List<List<string>> rows, string originalPath)
        {
            List<List<string>> rowsCopy = new List<List<string>>(rows);

            var files = new List<KeyValuePair<string, List<List<string>>>>();

            int counter = 1;
            Func<string> newpath = () => { return originalPath.Replace(".csv", counter++ + ".csv"); };

            if (rowsCopy.Count < MaxRowsInOneFile)
            {
                files.Add(new KeyValuePair<string, List<List<string>>>(originalPath, rowsCopy));
            }
            else
            {
                List<List<string>> fileRows;

                while (rowsCopy.Count > MaxRowsInOneFile)
                {
                    fileRows = rowsCopy.GetRange(0, MaxRowsInOneFile);
                    rowsCopy.RemoveRange(0, MaxRowsInOneFile);

                    files.Add(new KeyValuePair<string, List<List<string>>>(newpath(), fileRows));
                }

                fileRows = rowsCopy.GetRange(0, rowsCopy.Count());

                files.Add(new KeyValuePair<string, List<List<string>>>(newpath(), fileRows));
            }

            return files;
        }

        private string BuildCsvRow(List<string> rowCells)
        {
            StringBuilder builder = new StringBuilder();

            bool firstColumn = true;

            foreach (string value in rowCells)
            {
                if (value != null)
                {
                    if (!firstColumn)
                        builder.Append(SeparatorChar);
                    if (value.IndexOfAny(new char[] { '"', SeparatorChar }) != -1)
                    {
                        builder.AppendFormat("\"{0}\"", value.Replace("\"", "\"\""));
                    }
                    else
                    {
                        builder.Append(value);
                    }

                    firstColumn = false;
                }
            }
            return builder.ToString();
        }
    }