PagesSection.RenderAllHiddenFieldsAtTopOfForm Property

Definition

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

[System.Configuration.ConfigurationProperty("renderAllHiddenFieldsAtTopOfForm", DefaultValue=true)]
public bool RenderAllHiddenFieldsAtTopOfForm { get; set; }

Property Value

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

Attributes

Remarks

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.

Note

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

Applies to

Product Versions
.NET Framework 2.0, 3.0, 3.5, 4.0, 4.5, 4.5.1, 4.5.2, 4.6, 4.6.1, 4.6.2, 4.7, 4.7.1, 4.7.2, 4.8, 4.8.1