private void BtUpdate_Click(object sender, RoutedEventArgs e)
        {
            int EmpId = TransformStringIntoInt(TbId.Text);

            model_first_migration_testEntities testcontext = new model_first_migration_testEntities();

            try
            {
                employee emp = testcontext.employee.First(i => i.ID == EmpId);
                {
                    emp.Name = TbName.Text;

                    int    birth;
                    string b = TbBirthtYear.Text;
                    int.TryParse(b, out birth);
                    emp.BirthYear = birth;

                    testcontext.SaveChanges();
                    MessageBox.Show("Record Updated successfully.");
                    LoadToGrid();
                };
            }
            catch (Exception ex)
            {
                MessageBox.Show(ex.InnerException.ToString());
            }
        }
        private void BtDelete_Click(object sender, RoutedEventArgs e)
        {
            int EmpId = TransformStringIntoInt(TbId.Text);

            model_first_migration_testEntities testcontext = new model_first_migration_testEntities();

            try
            {
                employee emp = testcontext.employee.FirstOrDefault(i => i.ID == EmpId);
                testcontext.employee.Remove(emp);
                testcontext.SaveChanges();
                MessageBox.Show("Record Deleted successfully.");
                LoadToGrid();
            }
            catch (Exception ex)
            {
                MessageBox.Show(ex.InnerException.ToString());
            }
        }
        private void BtInsert_Click(object sender, RoutedEventArgs e)
        {
            model_first_migration_testEntities testcontext = new model_first_migration_testEntities();

            try
            {
                employee emp = new employee

                {
                    Name      = TbName.Text,
                    BirthYear = TransformStringIntoInt(TbBirthtYear.Text)
                };
                testcontext.employee.Add(emp);
                testcontext.SaveChanges();
                MessageBox.Show("Record Inserted successfully.");
                LoadToGrid();
            }
            catch (Exception ex)
            {
                MessageBox.Show(ex.InnerException.ToString());
            }
        }