Button.CausesValidation Property


Gets or sets a value indicating whether validation is performed when the Button control is clicked.

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

abstract CausesValidation : bool with get, set
override CausesValidation : bool with get, set

Property Value

Type: System.Boolean

true if validation is performed when the Button control is clicked; otherwise, false. The default value is true.

By default, page validation is performed when a Button control is clicked. 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.

You can specify or determine whether validation is performed on both the client and the server when a Button control is clicked by using the CausesValidation property. To prevent validation from being performed, set the CausesValidation property to false.


You should set the CausesValidation property to false when you are using the PostBackUrl property to post back to a different page. You should explicitly check validation when posting back to a different page. For an example, see the Remarks section of the PostBackUrl property.

This property is commonly set to false for a reset or clear button to prevent validation from being performed when the button is clicked.

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 Button 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.

The following code example demonstrates how to use the CausesValidation property to prevent page validation from occurring. Note that the Validate method activates each validation control independently.

System_CAPS_security Security Note

This example has a text box that accepts user input, which is a potential security threat. By default, ASP.NET Web pages validate that user input does not include script or HTML elements. For more information, see Script Exploits Overview.

No code example is currently available or this language may not be supported.

.NET Framework
Available since 1.1
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