private void Form1_Load(object sender, EventArgs e)
        {
          context = new autotestEntities();
         
          ObjectQuery<MarkaSet> MarkaObj = context.MarkaSet;
          ObjectQuery<TSSet> TSObj = context.TSSet; 
         
         

          var q1 = from Mark in MarkaObj
                   from TS in TSObj
                   where TS.Marka_Id == Mark.Id
                                     select new { TS.RegNumber, Mark.MarkaName };

         
          dataGridView1.DataSource = q1.ToList();
                                         
        
        }

       
        private void dataGridView1_CellValueChanged(object sender, DataGridViewCellEventArgs e)
        {
            try
            {

                context.SaveChanges();
            }
            catch(Exception x)
            {
               MessageBox.Show(x.Message);
            }
            
        }
    }