验证方式如下：
<asp:Table ID="Table1" runat="server" Height="43px" Width="285px" BorderColor="Black" BorderStyle="Solid" BorderWidth="1px" CellPadding="1" CellSpacing="1" GridLines="Both">
<asp:TableRow runat="server">
<asp:TableCell runat="server"><asp:TextBox ID="TextBox3" runat="server"></asp:TextBox></asp:TableCell>
<asp:TableCell runat="server">bbb</asp:TableCell>
</asp:TableRow>
<asp:TableRow runat="server">
<asp:TableCell runat="server">aaa</asp:TableCell>
<asp:TableCell runat="server">bbb</asp:TableCell>
</asp:TableRow>
</asp:Table>
<br />
<asp:RequiredFieldValidator ID="RequiredFieldValidator1" runat="server" ControlToValidate="TextBox3"
Display="None" ErrorMessage="bbbbbbbbbbb"></asp:RequiredFieldValidator>
<cc1:ValidatorCalloutExtender ID="ValidatorCalloutExtender1" runat="server" TargetControlID="RequiredFieldValidator1">
</cc1:ValidatorCalloutExtender>
<asp:Table ID="Table1" runat="server" Height="43px" Width="285px" BorderColor="Black" BorderStyle="Solid" BorderWidth="1px" CellPadding="1" CellSpacing="1" GridLines="Both">
<asp:TableRow runat="server">
<asp:TableCell runat="server"><asp:TextBox ID="TextBox3" runat="server"></asp:TextBox></asp:TableCell>
<asp:TableCell runat="server">bbb</asp:TableCell>
</asp:TableRow>
<asp:TableRow runat="server">
<asp:TableCell runat="server">aaa</asp:TableCell>
<asp:TableCell runat="server">bbb</asp:TableCell>
</asp:TableRow>
</asp:Table>
<br />
<asp:RequiredFieldValidator ID="RequiredFieldValidator1" runat="server" ControlToValidate="TextBox3"
Display="None" ErrorMessage="bbbbbbbbbbb"></asp:RequiredFieldValidator>
<cc1:ValidatorCalloutExtender ID="ValidatorCalloutExtender1" runat="server" TargetControlID="RequiredFieldValidator1">
</cc1:ValidatorCalloutExtender>
当验证时弹出的错误信息和文本框不在同一位置了，初步判断好像是和table的设置不兼容，如果我把GridLines="Both"改成其他方式就可以正常显示了，有没有谁碰到这个问题的？怎么解决？
本文转自永春博客园博客，原文链接：http://www.cnblogs.com/firstyi/archive/2006/11/01/547050.html，如需转载请自行联系原作者
