Vijayalakshmi G M Validation Controls

Contents  ASP.Net Validation Controls Overview  Types of Validation Controls

ASP.Net Validation Controls - Introduction

Validation Controls - Introduction  Validates User input data.  It can test for  Missing values  Comparison values  Values within a range  Ensures that proper data is supplied to processing scripts.  Associated with TextBox control.  Automatically performance the test when the Button, LinkButton, or ImageButton controls are clicked.

Validation Controls  When the validation test fails it displays the error message to the user.  User can reenter the value in the text box.

ASP.Net Validation Controls 1.RequiredFieldValidator 2.RangeValidator 3.CompareValidator 4.RegularExpressionValidator 5.CustomValidator 6.ValidationSummary

ASP.Net Validation Controls

Control  Tests the textbox for the missing value and displays an error message when value is not found  Used to Check the Mandatory Fields in the Web Forms.  General format

- Properties PropertyDescription ControlToValidateGives the id of the textbox to be validated. ErrorMessageIt provides text for the error message. SetFocusOnError Message Places the cursor in the associated text box. ValidationGroupIdentifies a grouping of TextBox controls to which a set of validation tests applies

 Note:  It occupies horizontal space on the page equal to the length of the error message.  The space is preallocated to display the messages.  When Display=“Dynamic” property is set the message space is not preallocated and it will be dynamically set.

Control  Tests the value within the range of the value.  Values data types 1.Currency (with a dollar sign and commas) 2.Date 3.Double (floating-point) 4.Integer 5.String (default).

RangeValidator – General Format

RangeValidator - Properties 1.ControlToValidate 2.ErrorMessage 3.SetFocusOnErrorMessage 4.ValidationGroup Note: Same as RequiredFieldValidator Control 1.Type – It specifies the data type. 2.MinimumValue – Sets the minimum value 3.MaximumValue – Sets the Maximum value

RangeValidator

 Compares the given value against a predefined value based on the comparison operation selected by the user.  The test can be made for the values with following data types. 1.Currency (with a dollar sign and commas) 2.Date 3.Double (floating-point) 4.Integer 5.String (default).

PropertyDescription OperatorSets the comparison operator. Value To Compare It is used to set the target value to be tested.

Control  This control is used to perform the additional test (Which cannot performed when used in combinations).  General Format

- Properties  Basic properties are similar to the RequiredFieldValidator Control. PropertyDescription IsValidSet to false to indicate the failure of the Validation Test OnServerVali date It calls a subprogram to perform explicitly coded tests. The called subprogram takes the special ServerValidateEventArgs argument.

- Properties

Regular Expression Validator  Used to validate complex expressions.  The expressions can be  phone number  address  zip code and many more.  Set the ValidationExpression property to any type of expression OR  Create the custom expression to validate the data.

Regular Expression Validator

 The individual error messages generated by separate controls can be displayed together.  It can limit its error reporting to an identified set of grouped controls.

General Format Example

 DisplayMode – Sets the display mode for the of the error summary.  ShowMessageBox – Display the error messages in the form of a message box.  ShowSummary – It suppresses the display of the error message on the page.

Resource

Resources  ASP.Net Validation Controls  doc/ctrlref/validation/validationsummary.aspx doc/ctrlref/validation/validationsummary.aspx  x?tutorial_id=46 x?tutorial_id=46  us/library/aa aspx us/library/aa aspx

Thank You