public void LoadData() { dtKho = new DataTable(); dtKho.Clear(); DataSet ds = nvkho.LayHangHoaDeBan(); dtKho = ds.Tables[0]; dv = new DataView(dtKho); dgvHangHoa.DataSource = dv; dgvHangHoa.AutoResizeColumns(); dtKhachHang = new DataTable(); dtKhachHang.Clear(); DataSet dskh = nvkh.LayKH(); dtKhachHang = dskh.Tables[0]; dvKH = new DataView(dtKhachHang); dgvKhachHang.DataSource = dvKH; dgvKhachHang.AutoResizeColumns(); dtNhanVien = new DataTable(); dtNhanVien.Clear(); DataSet dsnv = nvnv.LayNV(); dtNhanVien = dsnv.Tables[0]; dvNV = new DataView(dtNhanVien); dgvNhanVien.DataSource = dvNV; dgvNhanVien.AutoResizeColumns(); }