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HtmlTextWriter.IsValidFormAttribute Method

Checks an attribute to ensure that it can be rendered in the opening tag of a <form> markup element.

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

public virtual bool IsValidFormAttribute(
	string attribute


Type: System.String

A string that contains the name of the attribute to check.

Return Value

Type: System.Boolean
Always true.

The HtmlTextWriter class implementation of the IsValidFormAttribute method returns true for all attributes. Override the IsValidFormAttribute to limit the attributes that can be rendered in the opening tag of a <form> element.

Notes to Inheritors

Override the IsValidFormAttribute method to return true only for those attributes that can be included in the <form> element of the markup for which the class derived from the HtmlTextWriter class is intended.

.NET Framework

Supported in: 4.6, 4.5, 4, 3.5, 3.0, 2.0

Windows 8.1, Windows Server 2012 R2, Windows 8, Windows Server 2012, Windows 7, Windows Vista SP2, Windows Server 2008 (Server Core Role not supported), Windows Server 2008 R2 (Server Core Role supported with SP1 or later; Itanium not supported)

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

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