Failed to Load ViewState?

[rockdale]

Sometime my ASP.NET application got this error message but not always
everytime.

Failed to load viewstate. The control tree into which viewstate is
being loaded must match the control tree that was used to save
viewstate during the previous request. For example, when adding
controls dynamically, the controls added during a post-back must match
the type and position of the controls added during the initial request
I am using PageTemplate and dynamic load my user defined control.

Basically when user click on a linkbutton I will point back to
default.aspx with a parameter fID. then based on the fID to load ascx
into default.aspx page. Sometimes I will get the Failed to Load
ViewState error but not every time. Source code is attached, any help
please?

private void Page_Load(objec t sender, System.EventArg s e)
{
String userCtrlName = "Home";
System.Web.UI.C ontrol userCtrl;
String id="";

pbdTemplate.Tem platePath = "layoutTemplate .ascx";

if(Request.Para ms["fid"]!=null){
id = Request.Params["fid"].ToString ();

SqlStorage ss = new SqlStorage();
userCtrlName = ss.GetFunctionC ontrol(Convert. ToInt32(id));
}

userCtrl = Page.LoadContro l(userCtrlName) ;
content.Control s.Add(userCtrl) ;
}
I read some posts say disable viewstate, but this will disable most
events also (e.g. datagrid sorting...)

Thanks
-Rockdale

[rockdale]

Just assing some comments to my code
rockdale wrote:

Sometime my ASP.NET application got this error message but not always
everytime.

Failed to load viewstate. The control tree into which viewstate is
being loaded must match the control tree that was used to save
viewstate during the previous request. For example, when adding
controls dynamically, the controls added during a post-back must match
the type and position of the controls added during the initial request
I am using PageTemplate and dynamic load my user defined control.

Basically when user click on a linkbutton I will point back to
default.aspx with a parameter fID. then based on the fID to load ascx
into default.aspx page. Sometimes I will get the Failed to Load
ViewState error but not every time. Source code is attached, any help
please?

private void Page_Load(objec t sender, System.EventArg s e)
{
String userCtrlName = "Home";
System.Web.UI.C ontrol userCtrl;
String id="";

pbdTemplate.Tem platePath = "layoutTemplate .ascx";

if(Request.Para ms["fid"]!=null){
id = Request.Params["fid"].ToString ();

SqlStorage ss = new SqlStorage();
userCtrlName = ss.GetFunctionC ontrol(Convert. ToInt32(id));
}

userCtrl = Page.LoadContro l(userCtrlName) ;
content.Control s.Add(userCtrl) ; //Content is PlaceHolder
}
I read some posts say disable viewstate, but this will disable most
events also (e.g. datagrid sorting...)

Thanks
-Rockdale