private void setSLVatTu() { //txtSL.Text = "-"; //chkboxXacNhanXuat == true Double sl; if (chkboxXacNhanXuat.Checked == true && Double.TryParse(txtSL.Text.Trim().ToString(), out sl) == true) { reset_txtSL(); return; } //Check ID Kho int ID_kho = getIDKho(); if (getIDKho() < 0) { reset_txtSL(); return; } //Check VT if (cbMaVatTu.SelectedIndex == -1) { reset_txtSL(); return; } //Check Chất Lượng if (cbChatLuong.SelectedIndex == -1) { reset_txtSL(); return; } string Ma_vat_tu = cbMaVatTu.GetItemText(cbMaVatTu.SelectedItem); //cbMaVatTu.SelectedText.ToString(); //cbMaVatTu.Text.Trim().ToString(); int Id_chat_luong = Int32.Parse(cbChatLuong.SelectedValue.ToString()); clsTonKho TonKho = new clsTonKho(); Double SL = TonKho.getSL(Ma_vat_tu, ID_kho, Id_chat_luong); txtSL.Text = SL.ToString(); }