Error in Asp,net when Partial Keyword Missing

IN ASP.NET WHILE COMPILING WE FOUND FOLLOWING ERROR SOME TIME .. BASICALLY IT OCCURRED WHEN WE CUT PASTE ALL SOURCE CODE ERROR DESCRIPTION-

Error   1   'ASP.mapstream_aspx.GetTypeHashCode()': no suitable method found to override    c:\WINDOWS\Microsoft.NET\Framework\v2.0.50727\Temporary ASP.NET Files\mapserverviewer\873018e3\324f1da0\App_Web_hka7dgu6.0.cs
Error   2   'ASP.mapstream_aspx.ProcessRequest(System.Web.HttpContext)': no suitable method found to override   c:\WINDOWS\Microsoft.NET\Framework\v2.0.50727\Temporary ASP.NET Files\mapserverviewer\873018e3\324f1da0\App_Web_hka7dgu6.0.cs
Error   3   'ASP.mapstream_aspx' does not implement interface member 'System.Web.IHttpHandler.IsReusable'   c:\WINDOWS\Microsoft.NET\Framework\v2.0.50727\Temporary ASP.NET Files\mapserverviewer\873018e3\324f1da0\App_Web_hka7dgu6.0.cs

if you found error some thing like above then 1)first check out this in code behind file - public class Classname: System.Web.UI.Page 2) replace it with - public class partial Classname: System.Web.UI.Page your Problem should Solved.. -abid