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Timer refreshing all updatepanels to refresh

I have a single timer in my html and 3 updatepanels, i want to refresh a specific updatepanel and not the 2 others. However the timer is causing all updatepanels to refresh for some reason. This is my updatepanel code that i want to refresh:
<form id="form1" runat="server">
<asp:ScriptManager ID="ScriptManager1" runat="server"></asp:ScriptManager>
<asp:Timer runat="server" id="UpdateTimer" interval="2000" ontick="function" />
<asp:UpdatePanel ID="UpdatePanelMain" runat="server" updatemode="Conditional">
<Triggers>
<asp:AsyncPostBackTrigger controlid="UpdateTimer" eventname="Tick" />
</Triggers>
<ContentTemplate>
And the other updatepanels look like this without the triggers:
<asp:UpdatePanel ID="UpdatePanelDiag" runat="server">
<asp:UpdatePanel ID="UpdatePanelUi" runat="server">
However they are still updated, any idea why?

FileUpload.hasFile returning false inside update panel

I have been through several links but didn't find anything helpful. I know it has been asked several times here.
Here is my frontend code
<asp:UpdatePanel runat="server" ID="UpdatePanel1" UpdateMode="Conditional">
<ContentTemplate>
<asp:FileUpload runat="server" ID="fuItemImage" Width="370px" TabIndex="12" />
</ContentTemplate>
<Triggers>
</Triggers>
</asp:UpdatePanel>
Here is the backend code
if (fuItemImage.HasFile)
{
MyFunction.UploadThisFile(anything)
}
When I upload any image and click on the save button it shows false in FileUpload.HasFile. I am stuck and finding no solution for it.
Any help would be appreciated.

you can try this
<asp:ScriptManager runat="server"></asp:ScriptManager>
<asp:UpdatePanel runat="server" ID="UpdatePanel1" UpdateMode="Conditional">
<ContentTemplate>
<asp:FileUpload runat="server" ID="fuItemImage" Width="370px" TabIndex="12" />
<asp:Button ID="Button1" runat="server" OnClick="Button1_Click" Text="Button" />
</ContentTemplate>
<Triggers>
<asp:PostBackTrigger ControlID = "Button1" />
</Triggers>
</asp:UpdatePanel>
add the button id in triggers to upload the file which will do postback

Stopping auto page refresh

I use the below code to auto refresh the page every 60 seconds via the AJAX tools in VS2010. Works perfectly.
<asp:MultiView ID="MultiView1" runat="server">
<asp:View ID="View1" runat="server">
<asp:UpdatePanel ID="UpdatePanel1" runat="server" ViewStateMode="Enabled" UpdateMode="Conditional">
<ContentTemplate>
ASP.NET/HTML Code
<p>
<asp:Button ID="Button2" runat="server" Text="Click here" OnClick="Button2_Click" /> to disable the pages automatic refresh.</p>
</ContentTemplate>
<Triggers>
<asp:AsyncPostBackTrigger ControlID="Timer1" EventName="Tick" />
</Triggers>
</asp:UpdatePanel>
<asp:Timer ID="Timer1" runat="server" Interval="60000">
</asp:Timer>
</asp:View>
<asp:View ID="View2" runat="server">
etc.
</asp:MultiView>
I want to include a button on the asp.net page to cancel the auto refresh.
I tried to include the below but when I clicked the button, it didn't work. The below is the Code Behind for an OnClick event for a Button. The asp.net code is in the above code.
protected void Button2_Click(object sender, EventArgs e)
{
Timer1.Interval = 0;
}
Where am I going wrong? Is this even a way to do this or do I need to go another route in order to allow the user to cancel the auto page refresh?

Thanks to PeterJ I have found the solution. I modified the code and since I clicked it the page has not refreshed. The issue was with my code behind for the button OnClick event. I had:
Timer1.Interval = 0;
When I should have had:
Timer1.Enabled = false;

Working with multiple update panels and timer dedicated to specific updatepanel

I have the code on master page as follows:
<asp:Timer ID="Timer1" runat="server" Interval="10000" ontick="Timer1_Tick"></asp:Timer>
<asp:UpdatePanel ID="updateNotifications" runat="server" UpdateMode="Conditional">
<Triggers>
<asp:AsyncPostBackTrigger ControlID="Timer1" EventName="Tick" />
</Triggers>
<ContentTemplate>
//Content
</ContentTemplate>
</asp:UpdatePanel>
This is working fine and refreshes the content with defined interval, but it also updates all the update panels on the content pages. I have to refresh only the content inside this update panel. I have tried UpdateMode="Conditional" and UpdateMode="Always" too but to no help.

Timer in UpdatePanel

I have an asp:UpdatePanel with an asp:Timer. These are in a Master/Content Page. The code is below:
<asp:UpdatePanel ID="UpdatePanel1" runat="server" UpdateMode="Conditional">
<ContentTemplate>
<asp:Timer ID="Timer1" runat="server" Interval="5000" OnTick="Timer1_Tick"></asp:Timer>
</ContentTemplate>
</asp:UpdatePanel>
But when the timer fires, I get the folowing error:
Microsoft JScript runtime error: Sys.WebForms.PageRequestManagerParserErrorException: The message received from the server could not be parsed. Common causes for this error are when the response is modified by calls to Response.Write(), response filters, HttpModules, or server trace is enabled.
Details: Error parsing near '
This works in a standalone web form, but not in a content page with a master page.
Can anyone explain a fix for this?
Thanks in advance for any help!!

Is there a specifc reason why you have the Timer control in the UpdatePanel?
Every time I have needed to use a Timer control to cause an UpdatePanel refresh, I have set it up like the following and it works fine with MasterPages:
<asp:UpdatePanel ID="UpdatePanel1" runat="server" UpdateMode="Conditional">
<Triggers>
<asp:AsyncPostBackTrigger ControlID="Timer1" EventName="Tick" />
</Triggers>
<ContentTemplate>
<!-- your content here, no timer -->
</ContentTemplate>
</asp:UpdatePanel>
<asp:Timer ID="Timer1" runat="server" Interval="5000" OnTick="Timer1_Tick">
</asp:Timer>
Use the Trigger to cause the UpdatePanel to refresh from the Tick event. You only want to embed content in your UpdatePanel if possible.