label text is not updating in update panel as i have putted it in update panel while selecting a finacial year drop down and i have also set Auto postback= true for this drop down.

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C#

ASP.NET

.aspx page code is=>

<tr>
                  <td width="790px" colspan="2" align="center">
                      <fieldset>
                          <legend>Children below 6 month age</legend>
                          <asp:UpdatePanel ID="UpdatePanel9" runat="server">
                              <ContentTemplate>
                                  <table align="center" border="0">
                                      <tr>
                                          <td align="center" style="font-size:13px; background-color:#2a4866;font-family: arial;color: #FFFFFF; font-weight:bold ">
                                              Select Financial Year:
                                          </td>
                                          <td align="center">
                                              <asp:DropDownList ID="ddlFinaYrAdmtCrtBlw" runat="server" AutoPostBack="true" OnSelectedIndexChanged="ddlFinaYrAdmtCrtBlw_OnSelectedIndexChanged">
                                              </asp:DropDownList>
                                          </td>
                                      </tr>
                                  </table>
                                  <asp:Label ID="lblAdmissionNRCBelow" runat="server"></asp:Label>
                              </ContentTemplate>
                          </asp:UpdatePanel>
                      </fieldset>
                  </td>
              </tr>
              <tr>

and code behind =>

lblAdmissionNRCBelow.Text = "<img border='0' usemap='#imgMap9' src='pieChartServer.aspx?Legends=(" + strHeading + ")&Vals=(" + strValues +
")&Expload=(" + strExpload +
")&fontface=" + "verdana" +
"&fontsize=" + "8" +
"&LS=" + "10" +
"&RS=" + "10" +
"&TS=" + "10" +
"&BS=" + "10" +
"&pieRatio=" + "70" +
"&bar3dratio=" + "8" +
"&EoffSet=" + "35" +
"&imgFormat=" + 0 +
"&pieDia=" + 200 + "'>";
Response.Write(mychartdata.getImageMap("imgMap9"));