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