i have 3 tier architecture - data access layer dll is not found

Dear all,

I have started working in my asp.net project - I am now getting dll not found error and build is unsuccessful. I am getting error as dataaccesslayer dll is not found. If this is not working properly - I may create on more library for dataaccesslayer.

This is the Employee class file sample
using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;

namespace IFMR
{
    public class EmployeeMaster
    {
        private int empCode;
        private string empName;
        private string pgCode;
        private DateTime dob;
        private string sex;
        private string martial;
        private DateTime doj;
        private string divCode;
        private string brnCode;
        private string dptCode;
        private string dsgCode;
        private string grdCode;
        private string empID;
        private string firstName;
        private string lastName;
        private string gender;
        private string location;
        private string photoPath;
















        public int EmpCode
        {
            get { return empCode; }
            set { empCode = value; }
        }
        public string EmpName
        {
            get { return empName; }
            set { empName = value; }
        }
        public string PGCode
        {
            get { return pgCode; }
            set { pgCode = value; }
        }
        public DateTime Dob
        {
            get { return dob; }
            set { dob = value; }
        }

        public string Sex
        {
            get { return sex; }
            set { sex = value; }
        }
        public string Martial
        {
            get { return martial; }
            set { martial = value; }
        }
        public DateTime Doj
        {
            get { return doj; }
            set { doj = value; }
        }
        public string DivCode
        {
            get { return divCode; }
            set { divCode = value; }
        }
        public string BrnCode
        {
            get { return brnCode; }
            set { brnCode = value; }
        }
        public string DptCode
        {
            get { return dptCode; }
            set { dptCode = value; }
        }

        public string DsgCode
        {
            get { return dsgCode; }
            set { dsgCode = value; }
        }

        public string GrdCode
        {
            get { return grdCode; }
            set { grdCode = value; }
        }

        public string EmpID
        {
            get { return empID; }
            set { empID = value; }
        }

        public string FirstName
        {
            get { return firstName; }
            set { firstName = value; }
        }

        public string LastName
        {
            get { return lastName; }
            set { lastName = value; }
        }

        public string Gender
        {
            get { return gender; }
            set { gender = value; }
        }

        public string Location
        {
            get { return location; }
            set { location = value; }
        }

        public string PhotoPath
        {
            get { return photoPath; }
            set { photoPath = value; }
        }











    }
}

This is front end code
using System;
using System.Collections.Generic;
using System.Configuration;
using System.Data;
using System.Data.SqlClient;
using System.Linq;
using System.Web;
using System.Web.UI;
using System.Web.UI.WebControls;
using DataAccessLayer;

namespace cwdrweb
{
    public partial class Welcome : System.Web.UI.Page
    {
        protected void Page_Load(object sender, EventArgs e)
        {





        }

        protected void btnViewEmployees_Click(object sender, EventArgs e)
        {
            grdViewEmployees.Visible = true;
            grdViewEmployees.DataSource = DataAccessLayer.EmpDataAccessLayer.GetAllEmployees();
            grdViewEmployees.DataBind();



            //string cs7 = ConfigurationManager.ConnectionStrings["SampleConnectionString"].ConnectionString;
            //using(SqlConnection con5 = new SqlConnection(cs7))
            //{
            //    using(SqlCommand cmd6 = new SqlCommand("spGetAllEmployees",con5))
            //    {

            //        con5.Open();
            //       grdViewEmployees.DataSource = cmd6.ExecuteReader();
            //       grdViewEmployees.DataBind();
            //    }

            //}


        }
    }
}
Dataaccess layer - sample
using System;
using System.Collections.Generic;
using System.Configuration;
using System.Data;
using System.Data.SqlClient;
using System.Linq;
using System.Text;
using IFMR;


namespace DataAccessLayer
{
    public class EmpDataAccessLayer
    {


        public static List<EmployeeMaster> GetAllEmployees()
        {
            List<EmployeeMaster> listEmployeeMaster = new List<EmployeeMaster>();
            //string cs9 = ConfigurationManager.
            string cs7 = ConfigurationManager.ConnectionStrings["SampleConnectionString"].ConnectionString;
            using (SqlConnection con = new SqlConnection())
            {
                using (SqlCommand cmd8 = new SqlCommand("spGetAllEmployees", con))

                {
                    cmd8.CommandType = CommandType.StoredProcedure;
                    con.Open();
                    SqlDataReader rdr = cmd8.ExecuteReader();
                    while (rdr.Read())
                    {
                        EmployeeMaster employee = new EmployeeMaster();
                        employee.EmpID = rdr["EmpID"].ToString();
                        employee.FirstName = rdr["FirstName"].ToString();
                        employee.LastName = rdr["LastName"].ToString();
                        employee.Gender = rdr["Gender"].ToString();
                        employee.Location = rdr["Location"].ToString();
                        employee.PhotoPath = rdr["PhotoPath"].ToString();
                        listEmployeeMaster.Add(employee);



                    }




                    }




                }
            return listEmployeeMaster;




            }


        }

}

I was getting initialling squiggly line in ConfigurationManager - namespace - inspite of adding - using statement System.Configuration.

in one of the blog they mentioned - you may have to reference manually as well.

C:\Windows\Microsoft.Net\Framework\V2.0.5.0727\System.Configuration.dll - whether my project (dataaccesslayer dll got corrupted)

Any inputs are welcome.

Warm Regards,

sathya