How to Update Update panel portion as per developer requirement

How to Update Update panel  portion as per developer requirement means not updating all update panel when any post back occur.

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Step 1 : Add update panel to your page

  <asp:UpdatePanel ID="UpdatePanel1" runat="server">
        <ContentTemplate>
          
        </ContentTemplate>
    </asp:UpdatePanel>

Step 2 : Put you controls in update panel.

Step 3 : Add Two property value in your update panel 

  <asp:UpdatePanel ID="UpdatePanel1" runat="server" ChildrenAsTriggers="false"  UpdateMode="Conditional">
        <ContentTemplate>
           
        </ContentTemplate>
    </asp:UpdatePanel>

 Step 4 : When you want to update this panel just update the panel at server side by writing 

UpdatePanel1.Update();

Step 5 : Your panel will be updated when you write this code at server side .