C# asp gridview标题文本对齐

我需要的是：第一行是目标还是实际，下一行是休息

我现在拥有的

我在asp.net中有这个gridview模板字段

<asp:TemplateField HeaderStyle-CssClass="headerStyle" HeaderText="TARGET Approval Date" FooterStyle-CssClass="alternateStyler" ItemStyle-CssClass="alternateStyler" ItemStyle-Width="8%" ItemStyle-VerticalAlign="Top" FooterStyle-VerticalAlign="Top">
    <ItemTemplate>
        <asp:TextBox ID="dtTgtApprDate" CssClass="Datetext" Width="98%" Height="23px" runat="server" Text='<%# Eval("Phase2")%>'></asp:TextBox>
            </ItemTemplate>
            <FooterTemplate>
                <asp:TextBox ID="dtTgtApprDate2" CssClass="Datetext" Width="98%" Height="23px" runat="server">
                </asp:TextBox>
            </FooterTemplate>
        </asp:TemplateField>
        <asp:TemplateField HeaderStyle-CssClass="headerStyle" HeaderText="ACTUAL Approval Date" FooterStyle-CssClass="alternateStyler" ItemStyle-CssClass="alternateStyler" ItemStyle-Width="8%" ItemStyle-VerticalAlign="Top" FooterStyle-VerticalAlign="Top">
            <ItemTemplate>
                <asp:TextBox ID="dtActApprDate" CssClass="Datetext" Width="98%" Height="23px" runat="server" Text='<%# Eval("Phase3")%>'></asp:TextBox>
                    </ItemTemplate>
                    <FooterTemplate>
                        <asp:TextBox ID="dtActApprDate2" CssClass="Datetext" Width="98%" Height="23px" runat="server">
                        </asp:TextBox>
                    </FooterTemplate>
                </asp:TemplateField>

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由于标题也是HTML，因此您可以在其中添加一个

<asp:TemplateField HeaderText="TARGET<br>ApprovalDate">

<asp:TemplateField HeaderText="TARGET<br>ApprovalDate">