Common function from daily VBA programing use.
A helper includes the most of ADO function, including data querying, get record count, get error message, different db connection, open record set, get all row data, and etc.
A helper class contains common function whlie doing VBA project. The functions including date transform, get value between string, set dictionary from array, row count, column count, save as new worksheet or workbook, and etc.
A validation helper while do any checking.
A helper while read and write data from text files.