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PagesSection.RenderAllHiddenFieldsAtTopOfForm Property

Gets or sets a value that indicates whether all system-generated hidden fields are rendered at the top of the form.

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

[ConfigurationPropertyAttribute("renderAllHiddenFieldsAtTopOfForm", DefaultValue = true)]
public bool RenderAllHiddenFieldsAtTopOfForm { get; set; }

Property Value

Type: System.Boolean
true if system-generated hidden fields are rendered at the top of the form; otherwise, false. The default is true.

You can use the RenderAllHiddenFieldsAtTopOfForm property to specify that some system-generated hidden fields are rendered at the end of the form.

In versions of ASP.NET earlier than the .NET Framework 3.5 SP1, ASP.NET renders some hidden fields (for example, __VIEWSTATE) at the top of the form. Other hidden fields (for example, __EVENTVALIDATION) are rendered near the bottom of the form, just before the closing </div> tag. By default, in ASP.NET 3.5 SP1, all system-generated hidden fields are rendered at the top of the page. This makes sure that the information in these fields is sent to the server even if a postback is performed before the page has finished loading. If RenderAllHiddenFieldsAtTopOfForm is set to false, performing a postback before the page has finished loading can cause an "Invalid postback or callback argument" error.

NoteNote

Although the property name indicates "all hidden fields," user-created hidden fields are not affected by settings for this property.

.NET Framework

Supported in: 4, 3.5 SP1, 3.0 SP2, 2.0 SP2

Windows 7, Windows Vista SP1 or later, Windows XP SP3, 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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