Loading UserControl Dynamically in UpdatePanel

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C#

ASP.NET

Hi All,

I have a menu control on master page. On clicking any of the menu items, I am loading a user control on content page(Default.aspx) of master page.
I have used Update Panel and a Place holder inside on which i am loading the User Control.

The issue is that whenever i load the User Control, Whole page postbacks instead of the part within Update Panel.

How should i achieve partial postbacks on every menu item click instead of whole page postbacks.

Default.aspx

<asp:UpdatePanel runat="server" ID="pnlSecurityMain">

<contenttemplate>
     <asp:PlaceHolder runat="server" ID="plcDynamic">
</contenttemplate>

Codebehind

if (!node.IsNull())
                {
                    UserControl uc = (UserControl)this.LoadControl(node.UIControlId);
                    uc.ID = "ucDynamicControl";
                    plcDynamic.Controls.Add(uc);
                }

Thanks in Advance
Amit