protected void btn_search_Click( object sender, EventArgs e )
        {
            try
            {
                //defaultstatus();
                string input = this.txtbox_search.Text.ToString();
                BusinessTier.Admin admin = new BusinessTier.Admin();
                Data.DataBase.patientsDataTable table =  new Data.DataBase.patientsDataTable();

                if ( input.Length > 0 )
                {
                    table = admin.SearchPatientByID(input);
                    if ( table.Rows.Count > 0 )
                    {
                        this.gv_patientview.DataSource = table;
                        this.gv_patientview.DataBind();
                    }
                    else
                    {
                        this.lbl_searchwarning.Text = "Invalid ID, Please confirm the IDs before search...";
                        this.lbl_searchwarning.BackColor = System.Drawing.Color.Red;
                    }
                }
                else
                {
                    table = admin.SelectAllPatients();
                    this.gv_patientview.DataSource = table;
                    this.gv_patientview.DataBind();
                }
            }
            catch ( Exception ex )
            {
                this.lbl_searchwarning.Text = ex.Message;
            }
        }