C# code convert a pipe delimited CSV file to Datatable

public static DataTable ConvertPipedCSVToDataTable(string source)
        {
            DataTable dt = new DataTable();
            try
            {
                using (var stream = new MemoryStream())
                {
                    var input = source;
                    var bytes = System.Text.Encoding.Default.GetBytes(input);
                    stream.Write(bytes, 0, bytes.Length);
                    stream.Seek(0, SeekOrigin.Begin);
                    using (var csvReader = new TextFieldParser(stream))
                    {
                        csvReader.SetDelimiters(new string[] { "|" });
                        csvReader.HasFieldsEnclosedInQuotes = true;
                        string[] colFields = csvReader.ReadFields();
                        foreach (string column in colFields)
                        {
                            DataColumn datecolumn = new DataColumn(column);
                            datecolumn.AllowDBNull = true;
                            dt.Columns.Add(datecolumn);
                        }

                        while (!csvReader.EndOfData)
                        {
                            string[] fieldData = csvReader.ReadFields();
                            //Making empty value as null
                            for (int i = 0; i < fieldData.Length; i++)
                            {
                                if (fieldData[i] == "")
                                {
                                    fieldData[i] = null;
                                }
                            }
                            dt.Rows.Add(fieldData);
                        }

                        return dt;                        
                    }
                }
            }

            catch (Exception ex)
            {
                throw ex;
            }
        }