3-tier architecture

Question

Hello I am developing a 3 -tier application in asp.net in App_Code i have AddpatientBL.cs class file under HospitalMgmt.BL folder which contains properties as below and i am using sqlhelper.cs under HospitalMgmt.DAL to maintain all executenonquery ....etc using HospitalMgmt.DAL; public class AddPatientBL { string code; public string Code { get { return code; } set { code = value; } } public void AddPatient() { SqlParameter[] p = new SqlParameter[18]; p[0] = new SqlParameter(@code this.code); p[0].DbType = DbType.String; SqlHelper.ExecuteNonQuery(con CommandType.StoredProcedure SpAddPatient p); } and i created a webform.aspx and when i try to create an object for AddPatientBL .cs in webform.aspx its not getting created to call all properites in webform.aspx.Please reply as possible.Thank you

Vithal Wadje · Answer

This is not a 3-tier architecture or 3 Layered architecture which you are going to create its just a simple application because you are creating class files and putting in App code folder this does not make any layered or tier. When you have 1 UI application project  BAL(class Library project)DAL (class Library project) are in same solution explorer on single machine is called as 3 Layered architecture and when these all three project on different machines such as UI on 1 machineBAL on 2nd machineDAL on 3rd Machine then its called as 3-tier architecture.