CheckBool问题，小菜请教

                       
<asp:TemplateField HeaderText="有效性" SortExpression="VALID_FLAG">
                            <EditItemTemplate>
                                <asp:CheckBox ID="CheckBoxValid" runat="server" Checked='<%# CheckBool(Eval("VALID_FLAG").ToString())%>' />
                            </EditItemTemplate>
                            <ItemTemplate>
                                <asp:CheckBox ID="CheckBoxValidShow"  Enabled="false" Checked='<%# CheckBool(Eval("VALID_FLAG").ToString())%>' runat="server" ></asp:CheckBox>
                            </ItemTemplate>
                            <FooterTemplate>
                                <asp:CheckBox ID="chkUVALID" runat="server"/>
                            </FooterTemplate>
</asp:TemplateField>
<asp:TemplateField HeaderText="锁定" SortExpression="LOCK_FLAG">
                            <EditItemTemplate>
                                <asp:CheckBox ID="CheckBoxLock" runat="server" Checked='<%# CheckLockBool(Eval("LOCK_FLAG").ToString())%>' />
                            </EditItemTemplate>
                            <ItemTemplate>
                                <asp:CheckBox ID="CheckBoxLockShow"  Enabled="false" Checked='<%# CheckLockBool(Eval("LOCK_FLAG").ToString())%>' runat="server" ></asp:CheckBox>
                            </ItemTemplate>
                            <FooterTemplate>
                                <asp:TextBox ID="txtULOCK" runat="server" width="30" Visible="false"></asp:TextBox>
                            </FooterTemplate>
</asp:TemplateField>上面的CheckBool和CheckLockBool的具体作用是什么啊，有没有这个方法存在阿，是不是自己定义的函数阿，我在.net中运行提示没有这两个名字