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XhtmlTextWriter::IsValidFormAttribute Method

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

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

public:
virtual bool IsValidFormAttribute(
	String^ attributeName
) override

Parameters

attributeName
Type: System::String
The attribute name to check.

Return Value

Type: System::Boolean
true if the attribute can be applied to a <form> element; otherwise, false.

This method is useful to conditionally render an attribute depending on whether it is supported by the XHTML document type of the requesting device.

The following code example is part of a larger example that creates a custom Label control and an adapter that renders the content of the control as XHTML.

This code example demonstrates how to create a Boolean variable named attTest and set it to the return value that results from calling the IsValidFormAttribute method with the parameter value "style". If the IsValidFormAttribute method returns true, the styles that are associated with the control are rendered using the HtmlTextWriter::EnterStyle and HtmlTextWriter::ExitStyle methods. If the attTest value is false, the styles are not rendered. Instead, the page displays the text for the control, a <br/> element that is rendered by the WriteBreak method, and a text string informing the user that the XHTML content of the control has rendered conditionally.

This code example is part of a larger example provided for the XhtmlTextWriter class.

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

.NET Framework

Supported in: 4, 3.5, 3.0, 2.0

Windows 7, Windows Vista SP1 or later, Windows XP SP3, Windows XP SP2 x64 Edition, Windows Server 2008 (Server Core not supported), Windows Server 2008 R2 (Server Core supported with SP1 or later), Windows Server 2003 SP2

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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