does not contain a definition for and no extension method accepting a first argument of type could be found(are you missing a using directive or an reference?)

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C#

SQL-Server-2008

C#4.0

ASP.NET4

sir, iam a fresher and iam getting the following error and could't solve myself please help me out
MYCODE IN DAL IS
namespace DAL
{
public class DalEmployee
{
SqlConnection con = new SqlConnection("data source=.\\SQLEXPRESS;Integrated Security=SSPI;AttachDBFilename=|DataDirectory|Database1.sdf;User Instance=true");
public DataSet ds; SqlDataAdapter da; SqlCommandBuilder bldr;
public DalEmployee()
{
da = new SqlDataAdapter("Select * from Employe", con);
ds = new DataSet();
da.Fill(ds, "Employee");
da.FillSchema(ds, SchemaType.Source, "Employee");
bldr = new SqlCommandBuilder(da);
}
public void UpdateDB()
{
da.Update(ds, "Employee");
}
}
}
MYCODE IN BLL IS

using DAL;

namespace BLL
{
    public class BllEmployee
    {
        int Esalary, Eid, Edeptno; DataRow Rec;
        string Ename, Edesignation; DateTime Edoj;
        DalEmployee objdal = new DalEmployee();

        public int PEid
        {
            set { Eid = value; }
            get { return Eid; }
        }
        public string PEname
        {
            set { Ename = value; }
            get { return Ename; }
        }
        public string PEdesignation
        {
            set { Edesignation = value; }
            get { return Edesignation; }
        }
        public DateTime PEdoj
        {
            set { Edoj = value; }
            get { return Edoj; }
        }
        public int PEsalary
        {
            set { Esalary = value; }
            get { return Esalary; }
        }
        public int PEdeptno
        {
            set { Edeptno = value; }
            get { return Edeptno; }
        }
        BllEmployee obj = new BllEmployee();
        public void InsertRec()
        {
here    ->->  Rec = obj.ds.Tables[0].NewRow();// Here iam getting the error s
                    Rec[0] = Eid;
                    Rec[1] = Ename; 
        }

->->// BLL.BllEmployee does not contain a definition for ds and no extension method ds accepting afirst argument of type BLL.BllEmployee' could be found(are you missing a using directiveor an seeembly reference?)
Here iam not getting the dataset ds;