I can't see the extension methods of LINQ to SQL in Class Library 
I created a Class Library named Repository and which includes LINQ To SQL file which stores a ORM of SQL Server Database, besides that I also created another Class Library named Services which has the reference of the Repository class library and I want to use the LINQ to SQL file locating in Repository in Services but I can't see the Extension Methods but I can create an instance of the LinqToSQL in Services.

    using System;
    using System.Collections.Generic;
    using System.Linq;
    using System.Text;
    using Repository; // This is the referred class library
    
    
    
    namespace Core {
        class BugListService {
    
            BBDatabaseDataContext dbContext = new BBDatabaseDataContext();
    
            public int CreateBug(BugList bug) {
    
                dbContext.BugLists. // <= The extension methods don't appear in intellisense
            }
    
        }
    }


I can't see the extension methods of LINQ to SQL in Class Library 
===

I created a Class Library named Repository and which includes LINQ To SQL file which stores a ORM of SQL Server Database, besides that I also created another Class Library named Services which has the reference of the Repository class library and I want to use the LINQ to SQL file locating in Repository in Services but I can't see the Extension Methods but I can create an instance of the LinqToSQL in Services.

    using System;
    using System.Collections.Generic;
    using System.Linq;
    using System.Text;
    using Repository; // This is the referred class library
    
    
    
    namespace Core {
        class BugListService {
    
            BBDatabaseDataContext dbContext = new BBDatabaseDataContext();
    
            public int CreateBug(BugList bug) {
    
                dbContext.BugLists. // <= The extension methods don't appear in intellisense
            }
    
        }
    }

