The HiddenField component is meant to emulate the asp:HiddenField control in markup and is defined in the System.Web.UI.WebControls.HiddenField class
Value
the value of the hidden field component.OnValueChanged
Occurs when the value of the HiddenField component changes between posts to the server.
<asp:HiddenField
EnableTheming="True|False"
EnableViewState="True|False"
ID="string"
OnDataBinding="DataBinding event handler"
OnDisposed="Disposed event handler"
OnInit="Init event handler"
OnLoad="Load event handler"
OnPreRender="PreRender event handler"
OnUnload="Unload event handler"
OnValueChanged="ValueChanged event handler"
runat="server"
SkinID="string"
Value="string"
Visible="True|False"
/>