C validating data types

13-Aug-2016 22:17

If you choose to participate, the online survey will be presented to you when you leave the Msdn Web site. Eavesdropping attacks are often easy to launch, but most people don't worry about them in their applications.This class can be used to validate and filter different types of data.It can validate e-mail addresses, phone numbers and URLs.When a string appears literally in source code, it is known as a string literal or an anonymous string.Let Σ be a non-empty finite set of symbols (alternatively called characters), called the alphabet.The control also works well when bound to a data source.The Format event on a data binding can be used to reformat incoming data to comply with the mask, and the Parse event can be used to reformat outgoing data to comply with the specifications of the data field. If you want full programmatic control over validation, or need to perform complex validation checks, you should use the validation events built into most Windows Forms controls.

Depending on programming language and precise data type used, a variable declared to be a string may either cause storage in memory to be statically allocated for a predetermined maximum length or employ dynamic allocation to allow it to hold a variable number of elements.For example, a student's age might be 14, but if 11 is entered it will be valid but incorrect.There are a number of validation types that can be used to check the data that is being entered.You may require that certain text fields not be zero-length, that a field be formatted as a telephone number or other type of well-formed data, or that a string not contain any unsafe characters that could be used to compromise the security of a database.Windows Forms provides several ways for you to validate input in your application.

Depending on programming language and precise data type used, a variable declared to be a string may either cause storage in memory to be statically allocated for a predetermined maximum length or employ dynamic allocation to allow it to hold a variable number of elements.

For example, a student's age might be 14, but if 11 is entered it will be valid but incorrect.

There are a number of validation types that can be used to check the data that is being entered.

You may require that certain text fields not be zero-length, that a field be formatted as a telephone number or other type of well-formed data, or that a string not contain any unsafe characters that could be used to compromise the security of a database.

Windows Forms provides several ways for you to validate input in your application.

Let's imagine that I ask you to remember the number 5, and then I ask you to also memorize the number 2 at the same time.