https://learn.microsoft.com/en-us/dotnet/api/system.web.ui.webcontrols.webcontrol.loadviewstate?view=netframework-4.8.1&redirectedfrom=MSDN
WebControl.LoadViewState(Object) Method (System.Web.UI.WebControls) | Microsoft Learn
Restores view-state information from a previous request that was saved with the SaveViewState() method.
system webwebcontrolobjectmethodui