private void txttracuu_TextChanged(object sender, EventArgs e) { if (txttracuu.Text.Trim() == "") { List <TaiKhoan_DTO> lstTK = TaiKhoan_BUS.LayDSTK(); DgvTaiKhoan.DataSource = lstTK; } else { dieukien = "TaiKhoan"; List <TaiKhoan_DTO> lstTimKiem = TaiKhoan_BUS.Timtaikhoan(dieukien, txttracuu.Text); DgvTaiKhoan.DataSource = lstTimKiem; } }