生成多行两列式列表（table实现）

根据是奇数行还是偶数行来实现

 StringBuilder builder = new StringBuilder();
builder.Append(string.Format("document.write(\"<table width='100%' border='0' cellspacing='0' cellpadding='0'><tr>\");\n"));
for (int i = 0; i < ds.Tables[0].Rows.Count; i++)
{
 　switch (_type)
   {
    case 1: 
      if ((i % 2) == 0)
      {
        builder.Append(string.Format("document.write(\"<td><img src='showimages/news2.jpg' /></td><td><a href='{0}' target='_blank' title='{1}'>{2}</a></td><td></td>\");\n",
                                        pageUrl, title, Settings.SubStr(title, _length, 3)));
      }
      else if ((i % 2) == 1)
      {
        builder.Append(string.Format("document.write(\"<td><img src='showimages/news2.jpg' /></td><td><a href='{0}' target='_blank' title='{1}'>{2}</a></td></tr><tr>\");\n",
                                        pageUrl, title, Settings.SubStr(title, _length, 3)));
      }
      break;
   }
｝
 builder.Append(string.Format("document.write(\"</tr></table>\");\n"));