TableToCSV

        void TableToCSV(TextWriter output,DataTable table) {
            string FLD_FMT = "{0},";
            foreach(DataColumn column in table.Columns) {
                output.Write(string.Format(FLD_FMT,column.ColumnName));
            }
            output.WriteLine();

            foreach(DataRow row in table.Rows) {

                foreach(DataColumn column in table.Columns) {
                    object value = null;
                    if(row.IsNull(column))
                        value = "NULL";
                    else
                        value = row[column];
                    output.Write(string.Format(FLD_FMT,value));
                }
                output.WriteLine();
            }
        }

        void TableToCSV(StringBuilder output,DataTable table) {
            string FLD_FMT = "{0},";
            foreach(DataColumn column in table.Columns) {
                output.AppendFormat(FLD_FMT,column.ColumnName);
            }

            output.AppendLine();
            foreach(DataRow row in table.Rows) {

                foreach(DataColumn column in table.Columns) {
                    object value = null;
                    if(row.IsNull(column))
                        value = "NULL";
                    else
                        value = row[column];
                    output.AppendFormat(FLD_FMT,value);
                }
                output.AppendLine();
            }
        }