Ajax - How to force post back or update label from button click

I have a button and a click event from code behind.
i need to update a label after the button is clicked.

     protected void Button_Click(object sender, EventArgs e)
        {
             label.Text = "Start Time " + DateTime.Now.ToString();

             // LONG RUNNING STORED PROCEDURE


              label.Text = "End  Time " + DateTime.Now.ToString();

             
   }
LVL 1
JElsterAsked:
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Rajar AhmedConsultantCommented:
Try this,
http://msdn.microsoft.com/en-us/library/bb399001.aspx
<html xmlns="http://www.w3.org/1999/xhtml" >
<head runat="server">
    <title>Untitled Page</title>
   
</head>
<body>
    <form id="form1" runat="server">
        <asp:ScriptManager ID="ScriptManager1" runat="server">
        </asp:ScriptManager>
        <asp:UpdatePanel ID="UpdatePanel1" runat="server">
            <ContentTemplate>
                <asp:Label ID="Label1" runat="server" Text="Panel created."></asp:Label><br />
                <asp:Button ID="Button1" runat="server" OnClick="Button1_Click" Text="Button" />
               
            </ContentTemplate>
        </asp:UpdatePanel>
        
    </form>
</body>
</html>

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    protected void Button1_Click(object sender, EventArgs e)
    {
        Label1.Text = "Refreshed at " +
            DateTime.Now.ToString();
    }

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