Chapter 3-Lesson 1

• ValidationSummary control can be configured to display Pop-up error messages incase of invalid data.
• Page class contains a Validators collection containing all the validation controls put into it.
• Similarly, it contains the Validate( ) method which checks to see if data is valid on the page control. This method automatically runs after Page_Load( )
• We may use Page.IsValid property at any time during event handling to see if Page is still valid on the server.
• Client validation is by default enabled for all user controls. Use EnableClientScript to turn it off.
• To set the Focus on a particular control, use Focus( ) method.
• SetFocusOnError property on validation control ensures that the user does not leave the control until entered data is valid. This is set to false by default.
• If we wish to have a control bypass validation checks on page (and cause Postback) we may use its CausesValidation property.
• ValidationGroup property allows to treat set of validation control on a page as a group, so that if a Postback occurs only for that validation group, only controls within that group would be validated.
• The InitialValue property of the RequiredFieldValidator is used to define a value that we may have set as 'Default Value/Text' on a given control to suggest that this value must be changed by the user.
• CompareValidator may be used to compare a control values against a given constant. Or it may simply be used to check that the data entered in a given control belongs to a specific data type. Set Operator property to DataTypeCheck in that case.