... retrieve data from a data source, write data back to a data source, and execute commands against the data source. The most important class in each of these namespaces is a data adapter class (in the ... newline character. [ string of characters] This matches any single character that belongs to the string of characters. For example, [abc] matches the single character a, b, or c. A dash can also ... used in the character list, for instance, [ 0-9 ] matches any single digit. We can also write [ 0-9 a- z] to match any single digit or any single lowercase character, and [a- zA-Z] to match any single...