Refresh a GridView inside UserControl On Button Click in ASP.Net

I have a Page (created using master page) it has a UserControl and i want to reload the UserControl on button click (button in page outside the UserControl). I do not want to reload entire page. I want to reload just the UserControl. ASPX:  

<asp:UpdatePanel runat="server" id="UpdatePanel" updatemode="Conditional">
        <Triggers>
            <asp:AsyncPostBackTrigger controlid="Button1" eventname="Click" />
        </Triggers>
            <ContentTemplate>
              
               
               
               
               <uc2:GetUserScraps ID="GetUserScraps1" runat="server" />
               
               
                
     </ContentTemplate>
        </asp:UpdatePanel>

I am not sure what to do on code behind.