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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; }
<asp:TextBox CausesValidation="True|False" />

Property Value

Type: System.Boolean
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 ASP.NET Themes and Skins Overview.

Windows 7, Windows Vista, Windows XP SP2, Windows XP Media Center Edition, Windows XP Professional x64 Edition, Windows XP Starter Edition, Windows Server 2008 R2, Windows Server 2008, Windows Server 2003, Windows Server 2000 SP4, Windows Millennium Edition, Windows 98

The .NET Framework and .NET Compact Framework do not support all versions of every platform. For a list of the supported versions, see .NET Framework System Requirements.

.NET Framework

Supported in: 3.5, 3.0, 2.0

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