// Import to Database
            using (pwpEntities dc = new pwpEntities())
            {
                foreach (DataRow dr in ds.Tables[0].Rows)
                {
                    string FirstName = dr["First Name"].ToString();
                    var v = dc.tblUserDetailsProp.Where(a => a.vchFirstName.Equals(FirstName)).FirstOrDefault();
                    if (v != null)
                    {
                        // Update here
                        v.CompanyName = dr["Company Name"].ToString();
                        v.vchLocation = dr["Location"].ToString();
                        v.vchFirstName = dr["First Name"].ToString();
                        v.vchMobile1 = dr["Mobile 1"].ToString();
                        v.vchMobile = dr["Mobile"].ToString();
                        v.vchEmail = dr["Email"].ToString();
                        v.vchUserName = dr["User Name"].ToString();
                        v.ServiceId = Convert.ToInt32(dr["Service Id"]);
                        v.vchPassword = dr["Password"].ToString();
                        v.UserTypeFkId = Convert.ToInt32(dr["UserTypeFkId"]);
                    }
                    else
                    {
                        // Insert
                        dc.tblUserDetailsProp.Add(new tblUserDetails
                        {
                            CompanyName = dr["Company Name"].ToString(),
                            vchLocation = dr["Location"].ToString(),
                            vchFirstName = dr["First Name"].ToString(),
                            vchMobile1 = dr["Mobile 1"].ToString(),
                            vchMobile = dr["Mobile"].ToString(),
                            vchEmail = dr["Email"].ToString(),
                            vchUserName = dr["User Name"].ToString(),
                            ServiceId = Convert.ToInt32(dr["Service Id"]),
                            vchPassword = dr["Password"].ToString(),
                            UserTypeFkId = Convert.ToInt32(dr["UserTypeFkId"])
                        });
                    }
                }

                dc.SaveChanges();
            }

public partial class tblUserDetails
{
    public int intId { get; set; }
    public string vchFirstName { get; set; }
    public string vchLastName { get; set; }
    public string vchUserName { get; set; }
    public string vchPassword { get; set; }
    public string vchEmail { get; set; }
    public string vchIMEI { get; set; }
    public Nullable<double> Weight { get; set; }
    ...
}

using System;
using System.Data.Entity;
using System.Data.Entity.Infrastructure;

public partial class pwpEntities : DbContext
{
public pwpEntities()
    : base("name=pwpEntities")
{
}

protected override void OnModelCreating(DbModelBuilder modelBuilder)
{
    throw new UnintentionalCodeFirstException();
}

public DbSet<tblUserDetails> tblUserDetailsProp { get; set; }
}