How i can get just change row in DB ?

public class Employee
{
        System.Windows.Forms.BindingSource Source;
        public Employee()
        {            
            Source = new System.Windows.Forms.BindingSource();
            ReLoadEmployee(true);
        }
        
        private void ReLoadSource(bool Refreash = false)
        {
            if (Refreash)
            {
                Source.DataSource = 
                            Bll.Controller.EmployeesControl.SelectAllEmployee();
            }
            else
            {
                Source.ResetBindings(true);

                DataGridView.DataSource = Source;                
            }
        }
}