//返回销售按钮
private void btnReturn_Click(object sender, EventArgs e)
{
//可能出现结账之后返回销售界面的情况，要保持原来的iscash值
//sell.isCash = false;
sell.Show();
this.Dispose();
}
//打开销售收银界面
private void btnSell_Click(object sender, EventArgs e)
{
string comBHS = ConfigHelper.GetAppConfig("BHS_Com");
string comKXP = ConfigHelper.GetAppConfig("KXP_Com");
if (comBHS == "" || comKXP == "")
{
MessageBox.Show("请在系统管理界面选择扫描枪或客显串口！");
return;
}
frmSell sellFrm = new frmSell(staff, this);
sellFrm.Show();
this.Hide();
}