UserControl.SaveViewState Method
.NET Framework 4
Saves any user control view-state changes that have occurred since the last page postback.
Assembly: System.Web (in System.Web.dll)
The following example demonstrates a user control that manages its view state using the LoadViewState and SaveViewState methods.
public string UserText { get { return (string)ViewState["usertext"]; } set { ViewState["usertext"] = value; } } public string PasswordText { get { return (string)ViewState["passwordtext"]; } set { ViewState["passwordtext"] = value; } } [System.Security.Permissions.PermissionSet(System.Security.Permissions.SecurityAction.Demand, Name="FullTrust")] protected override void LoadViewState(object savedState) { object[] totalState = null; if (savedState != null) { totalState = (object[])savedState; if (totalState.Length != 3) { // Throw an appropriate exception. } // Load base state. base.LoadViewState(totalState[0]); // Load extra information specific to this control. if (totalState != null && totalState[1] != null && totalState[2] != null) { UserText = (string)totalState[1]; PasswordText = (string)totalState[2]; } } } [System.Security.Permissions.PermissionSet(System.Security.Permissions.SecurityAction.Demand, Name="FullTrust")] protected override object SaveViewState() { object baseState = base.SaveViewState(); object[] totalState = new object[3]; totalState[0] = baseState; totalState[1] = user.Text; totalState[2] = password.Text; return totalState; }
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.