Abhijit's World of .NET

we generally used update panel to do the partial page postback, which means to postback the controls which are only inside the update panel. For achieve this we simply call Update() method for the corresponding Update Panel. This thing is quite simple when we are trying to update any control which is inside the updatepanel itself. But, The problem may come when we want to update the controls which are outside of UpdatePanel and we need to update the same while updating then control inside updatepanel.

To make it simple. Let’s consider below scenarios. In our web page, we have Two labels (Label1 and Label2). Lable1 present inside the updatePanle and Label2 is in the outside of updatePanel. We have one Button say Button1, which is also inside the UpdatePanel. Now, our requirement is to update the Label2 while we are updating Label1 by Clicking Button1.

below is the code block for above scenarios

      <asp:UpdatePanel ID="UpdatePanel1" runat="server" UpdateMode=Conditional>
            <ContentTemplate>
                <asp:Label ID="Label1" runat="server" Text="Label"></asp:Label>
                <asp:Button ID="Button1" runat="server" Text="Update Button"  onclick="Button1_Click" />
            </ContentTemplate>
        </asp:UpdatePanel>
     <asp:Label ID="Label2" runat="server" Text="Label"></asp:Label>

Now, if we click on “Button1″, it will update only the content of Label1 not Lable2.

The solutions is to use ScriptManager.RegisterDataItem() . Using RegisterDataItem() methods we can register any control with the Particular Page ScriptManager Instance. While registering we need to provide the Control name along with the data item for the control which we want to render. (more…)