Could not find type 'SampleListViewPopulation.CustomersBO'. Please make sure that the assembly that contains this type is referenced. If this type is a part of your development project, make sure that the project has been successfully built.  
Could not find type 'SampleListViewPopulation.OrdersBO'. Please make sure that the assembly that contains this type is referenced. If this type is a part of your development project, make sure that the project has been successfully built.  
Could not find type 'SampleListViewPopulation.OrderItemsBO'. Please make sure that the assembly that contains this type is referenced. If this type is a part of your development project, make sure that the project has been successfully built.  
 
Could not find type 'SampleListViewPopulation.ProductsBO'. Please make sure that the assembly that contains this type is referenced. If this type is a part of your development project, make sure that the project has been successfully built.  
The variable 'CustomersBO1' is either undeclared or was never assigned 

I have BO in Solution Explorer but File have a error and dont see a Designer. How i configure Form Example for i see ?

Have you built your solution? For the designer to see any components (like BOs) or controls, you have to build the solution containing those components or controls.



If you have a project for your BOs, you can just build it...right click on solution and select build.



Hope that's it!

Oops...when I said "solution" i really meant "project". I.e. you need to build the project that contains the BOs...