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copied!<p>Maybe I'm just missing the point, but you should explicitly call the base class constructors in your hierarchy.</p> <p>This should work:</p> <pre><code>// Level 0 (Root Base Class) public abstract class BusinessDataControllerBase<BDA> : IBusinessDataController { protected BDA da; public BusinessDataControllerBase() { // Initialize the respective Data Access Layer passed by the concrete class this.da = new BDA(); } } // Level 1 (Second Level Base Class) public abstract class BusinessRootDataControllerBase<BDA> : BusinessDataControllerBase<BDA>, IBusinessRootDataController where BDA : IBusinessDALController, new() { public BusinessRootDataControllerBase() : base() {} } // Level 2 (Third Level Base Class) public abstract class BusinessMasterRootDataControllerBase<BRC, BRD, BDA> : BusinessRootDataControllerBase<BDA>, IDisposable where BRC : IBusinessRootDataController where BRD : IBusinessRootData where BDA : IBusinessDALController, new() { public BusinessMasterRootDataControllerBase() : base() {} } // Level 3 (Concrete Class) public class UserController : BusinessMasterRootDataControllerBase<UserController, UserData, UsersDAL> { # region Singleton implementation - Private Constructor, Static initialization private static readonly UserController instance = new UserController(); public static UserController Instance { get { return instance; } } # endregion # region Constructor // -------------------------------------------------------------------------------- //Private Constuctor private UserController() : base() { } // -------------------------------------------------------------------------------- private void DoLogin(string userName, string password) { DataSet dstUser = da.GetUser(userName); // Check user name // Check password } } </code></pre>

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