public tblPatient GetPatientBLK(string blk)
        {
            try
            {
                using (MedicalInstitutionNedeljniEntities context = new MedicalInstitutionNedeljniEntities())
                {
                    tblPatient user = (from e in context.tblPatients where e.BLK.Equals(blk) select e).First();


                    return user;
                }
            }
            catch (Exception ex)
            {
                System.Diagnostics.Debug.WriteLine("Exception" + ex.Message.ToString());
                return null;
            }
        }