<asp:GridView ID="GridView1" runat="server" AutoGenerateColumns="False" DataKeyNames="SiteLogId"
            DataSourceID="SqlDataSource1">
            <Columns>
                <asp:BoundField DataField="SiteLogId" HeaderText="SiteLogId" InsertVisible="False"
                    ReadOnly="True" SortExpression="SiteLogId" />
                <asp:BoundField DataField="DateTime" HeaderText="日期" SortExpression="DateTime" />
                <asp:BoundField DataField="PortalId" HeaderText="PortalId" SortExpression="PortalId" />
            </Columns>
        </asp:GridView>
        <asp:SqlDataSource ID="SqlDataSource1" runat="server" ConnectionString="<%$ ConnectionStrings:DatabaseConnectionString3 %>"
            SelectCommand="SELECT [SiteLogId], [DateTime], [PortalId] FROM [SiteLog] WHERE ([DateTime] >= @DateTime)">
            <SelectParameters>
                <asp:Parameter DefaultValue="2007/01/02" Name="DateTime" Type="DateTime" />
            </SelectParameters>
        </asp:SqlDataSource>

I can get the correct information I want, but the problem is the header text "日期" here. I can't see the localization character. Does anybody know how to solve this problem?

ps: these codes works fine when I used in the normal aspx file.