call code-behind method from markup

[ZeBula8]

How do I call a code-behind method from my markup?
I want to call this method in the OnClick event as shown below: AddRow()

 <asp:TemplateField>
                <HeaderTemplate>
                    <asp:Button ID="AddButton" runat="server" Text="Add" OnClick='<%#AddRow()%>' />
                </HeaderTemplate>
                <ItemStyle  HorizontalAlign="Center" />
                <ItemTemplate>
                    <asp:LinkButton ID="DeleteLinkButton" runat="server" CausesValidation="False" CommandArgument='<%# Container.DataItemIndex %>'
                        CommandName="Delete" Text="Delete"></asp:LinkButton>
                </ItemTemplate>
            </asp:TemplateField>