//检测域名是否已被添加
 protected void domListT1_TextChanged(object sender, EventArgs e)
 {
     if (domListBll.isExist(domListT1.Text.Trim()) > 0)
     {
         remindL.Text       = "该域名已存在,无法添加";
         domListBtn.Enabled = false;
     }
     else
     {
         remindL.Text       = "该域名可注册!";
         domListBtn.Enabled = true;
     }
     domListDP_SelectedIndexChanged(null, null);
 }