Developing and Implementing Windows®-Based Applications with Visual C#™ .NET and Visual Studio® .NET Exam Cram™ 2 (Exam 70-316)

Validating User Input

To make your application as robust as possible, the best solution to invalid or incorrect user input is to prevent the entry of “bad” data as often as possible. Validating user input before hand provides a better solution than very complex error-handling code that might add a great deal of resource overhead to your program. Four basic techniques are used to validate user input:

• Restricting the available values by using the proper type of control, configured with a specific list of allowed values. Controls such as RadioButton, ListBox, ComboBox, and CheckBox are often used for this type of validation. Configuring properties of the controls allows additional restriction of user input, such as controlling the case or length ...