LAbel is not displaying assigned value during runtime

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C#

ASP.NET

In the following code I have a button and a label inside a table within updatepanel.
During runtime on click of that button, I increment variable v_mycart by one and assign it to LblMyCart. But, the display for LblMyCart is not showing the latest value in LblMyCart.text. How to make the latest value to display immediately once the label control's value changes?

<asp:UpdatePanel ID="hh" runat="server" >
    <ContentTemplate>
    <div>
    <table class="" style=" margin-left:1145px; height:43px; margin-top:-90px;  " width="300">
    <tr>
    <td>
    <asp:Button id="BtnMyCart" runat="server"  OnClick="BtnMyCart_Click" BorderStyle="None" Text="My Cart" ForeColor="#666666"
    style=" margin-left:-8px; height:36px; cursor:pointer; margin-top:51px; width:50px; text-align:center;  background-color:Transparent; font-weight:normal" />
    </td>
    <td>
    <asp:Label ID="LblMyCart" runat="server" ForeColor="#333333" Text="0" BackColor="White"  style="  font-size:medium; font-weight:normal; width:45px; margin-top:16px; position:absolute;  text-align:left; margin-left:-245px; "></asp:Label>
    </td>
    </tr>
    </table>
    </div>
 </ContentTemplate>
 </asp:UpdatePanel>

v_MyCart = v_MyCart + 1;
              Session["mycart"] = v_MyCart;
              LblMyCart.Text = Convert.ToString("(" + v_MyCart + ")");
              LblMyCart.Visible = true;