Question

what is validation and types of validation in vb 6.0
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Answer 1

Answer:

Explanation:

Data validation is the process of ensuring, at least as far as is possible, that the data given to a program by a user or from a file (essentially, the program's input) is of the correct type, and in the correct format.

Types of validation-

1.Permitted character check - useful for determining whether an input string contains valid characters. For example, a telephone number may include the digits 0-9, and the non-numeric characters "+" and "-", as well as spaces and brackets.

2.Type check - the data entered must be of the correct datatype. If an integer value is expected, floating-point values (or any other non-integer values) will not be accepted.

3.Format check - this sort of check is often applied to things like dates. Programs often expect dates to be entered in a very specific format (e.g. dd/mm/yyyy or dd:mm:yyyy). The same principle can be applied to things like credit card or bank account numbers, where a specific minimum number of digits is expected and non-numeric characters (usually) not permitted.

4.Range check - often used for numeric values that must fall within a pre-defined range of values (for example, permitted operating temperatures, a person's age, or a valid day of the month).

5.Limit check - used for numeric values that must either be greater than or equal to some lower limit, or less than or equal to some upper limit (e.g. a minimum order quantity, or the maximum number of books someone can borrow from a library at one time).

6.Value entered check - used for things like required fields in online forms where the user must enter some data (for example their name or telephone number) and must not leave the field blank.