I have made a website project in VS2005. I am using SF 1.5.1

• added the DataSourceItem to DataLayer in Global.asax,
• created a BusinessObject mapped with the database table
• created an ApplicationBasedPage(ABP) and declared my BO as well
• inherited an ASPX from ABP, called the BO.FillDataTable method and bound the result to DataGrid

When i execute the project, i get the following exception :

System.Security.SecurityException: That assembly does not allow partially trusted callers.

After doing some web search, found teh following links related to the problem but could not find the solution for the same.

http://msdn2.microsoft.com/en-us/library/ms345097.aspx

http://blogs.msdn.com/shawnfa/archive/2005/02/04/367390.aspx

Request you to assist ASAP.