ASP.NET Tutorial
ASP.NET HOME ASP.NET IntroWP Tutorial
WebPages Intro WebPages Razor WebPages Layout WebPages Folders WebPages Global WebPages Forms WebPages Objects WebPages Files WebPages Helpers WebPages WebGrid WebPages Charts WebPages Email WebPages PHP WebPages Publish WebPages ExamplesWP References
WebPages Classes WebPages Security WebPages Database WebPages WebMail WebPages HelpersASP.NET Razor
Razor Intro Razor Syntax Razor C# Variables Razor C# Loops Razor C# Logic Razor VB Variables Razor VB Loops Razor VB LogicASP.NET MVC
MVC Intro MVC Application MVC Folders MVC Layout MVC Controllers MVC Views MVC Database MVC Models MVC Security MVC HTML Helpers MVC Publish MVC ReferenceWF Tutorials
WebForms Intro WebForms Pages WebForms Controls WebForms Events WebForms Forms WebForms ViewState WebForms TextBox WebForms Button WebForms Data Binding WebForms ArrayList WebForms Hashtable WebForms SortedList WebForms XML Files WebForms Repeater WebForms DataList WebForms DbConnection WebForms Master Pages WebForms Navigation WebForms ExamplesWF References
WebForms HTML WebForms Controls WebForms ValidationASP.NET RequiredFieldValidator Control
Validation Server Controls
Definition and Usage
The RequiredFieldValidator control is used to make an input control a required field.
With this control, the validation fails if the input value does not change from its initial value. By default, the initial value is an empty string ("").
Note: Leading and trailing spaces of the input value are removed before validation.
Note: The InitialValue property does not set the default value for the input control. It indicates the value that you do not want the user to enter in the input control.
Properties
| Property | Description |
|---|---|
| BackColor | The background color of the RequiredFieldValidator control |
| ControlToValidate | The id of the control to validate |
| Display | The display behavior for the validation control. Legal values are:
|
| EnableClientScript | A Boolean value that specifies whether client-side validation is enabled or not |
| Enabled | A Boolean value that specifies whether the validation control is enabled or not |
| ErrorMessage | The text to display in the ValidationSummary control when validation fails. Note: This text will also be displayed in the validation control if the Text property is not set |
| ForeColor | The foreground color of the control |
| id | A unique id for the control |
| InitialValue | Specifies the starting value of the input control. Default value is "" |
| IsValid | A Boolean value that indicates whether the control specified by ControlToValidate is determined to be valid |
| runat | Specifies that the control is a server control. Must be set to "server" |
| Text | The message to display when validation fails |
Example
RequiredFieldValidator
Declare two TextBox controls, one Button control, and one RequiredFieldValidator control in an .aspx file. It
shows how to use the RequiredFieldValidator control to make the "txt_name" textbox a required field.
Validation Server Controls
Your suggestion:
Close [X]
Thank You For Helping Us!
Your message has been sent to W3Schools.
Close [X]
