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TextBox.CausesValidation Property

Gets or sets a value indicating whether validation is performed when the TextBox control is set to validate when a postback occurs.

Namespace: System.Web.UI.WebControls
Assembly: System.Web (in system.web.dll)

[ThemeableAttribute(false)] 
public virtual bool CausesValidation { get; set; }
/** @property */
public boolean get_CausesValidation ()

/** @property */
public void set_CausesValidation (boolean value)

public function get CausesValidation () : boolean

public function set CausesValidation (value : boolean)

Not applicable.

Property Value

true if validation is performed when the TextBox control is set to validate when a postback occurs; otherwise, false. The default value is false.

Use the CausesValidation property to determine whether validation is performed on both the client and the server when a TextBox control is set to validate when a postback occurs. Page validation determines whether the input controls associated with a validation control on the page all pass the validation rules specified by the validation control.

By default, a TextBox control does not cause page validation when the control loses focus. To set the TextBox control to validate when a postback occurs, set the CausesValidation property to true and the AutoPostBack property to true.

When the value of the CausesValidation property is set to true, you can also use the ValidationGroup property to specify the name of the validation group for which the TextBox control causes validation.

This property cannot be set by themes or style sheet themes. For more information, see ThemeableAttribute and Introduction to ASP.NET Themes.

Windows 98, Windows Server 2000 SP4, Windows Server 2003, Windows XP Media Center Edition, Windows XP Professional x64 Edition, Windows XP SP2, Windows XP Starter Edition

The Microsoft .NET Framework 3.0 is supported on Windows Vista, Microsoft Windows XP SP2, and Windows Server 2003 SP1.

.NET Framework

Supported in: 3.0, 2.0

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