Unable to cast object of type 'ASP.ProjectName_master' to type 'PrijectName.master'

[Hicham Belkhadi]

Hello everybody,

I'm building a website in vs2010, i generate usercontrols (aspx and ascx pages), if i run the website i get the error : unable to cast object of type 'ASP.ProjectNam e_master' to type 'ProjectName.ma ster'
I have a folder 'App_Code' under my startproject, that's not a default asp folder any more i think since vs2005, is that maybe the problem?
Under the App_Code folder i have the master.cs file, in this file i get the error.

 public ProjectName.MasterPage Layout
        {
            get
            {
                return (ProjectName.MasterPage)this.Master;
            }
        }
        #endregion

I appreciate any idea/suggestions.
Thanks.

[mzmishra]

Refer this link.You may find something helpful

http://forums.asp.net/t/954194.aspx?PageIndex=7