ASP.NET

<asp:Panel ID="panelJobType" runat="server" CssClass="modalPopup">
           <asp:Panel ID="panelJobTypeHead" runat="server" Style="cursor: move; background-color: #DDDDDD;
               border: solid 1px Gray; color: Black">
               <div>
                   <p>
                       Add the Job Type</p>
               </div>
           </asp:Panel>
           <div>
               <table>
                   <tr>
                       <td width="28" height="17">
                       </td>
                       <td align="left" valign="top" class="search" width="168" height="17">
                           Job Type:
                       </td>
                       <td align="left" valign="top" width="291" height="17">
                           <asp:TextBox ID="txt_Ctitle" runat="server" CssClass="border" size="25" MaxLength="50"></asp:TextBox>
                           <font class="msg">*</font>
                       </td>
                   </tr>
                   <tr>
                       <td colspan="3" height="5">
                       </td>
                   </tr>
                   <tr>
                       <td height="25" colspan="3">
                       </td>
                   </tr>
                   <tr>
                       <td colspan="3" bgcolor="074264" align="right" valign="bottom" class="heading5" height="25">
                           <asp:Button ID="btnSubmitJob" CssClass="rpt_btn" runat="server" Text="Save" />
                           <asp:Button ID="btnCancel" CssClass="rpt_btn" runat="server" Text="Cancel" />
                       </td>
                   </tr>
               </table>
           </div>
       </asp:Panel>
       <ajaxToolkit:ModalPopupExtender ID="ModalPopupExtender" runat="server" TargetControlID="LinkButton1"
           PopupControlID="panelJobType" BackgroundCssClass="modalBackground"
            OkControlID="btnSubmitJob" CancelControlID="btnCancel"
           DropShadow="true" PopupDragHandleControlID="panelJobTypeHead" />

Could not load file or assembly 'ServerTime' or one of its 
dependencies. The located assembly's manifest definition does not match the
 assembly reference. (Exception from HRESULT: 0x80131040)
Description: An unhandled exception occurred during the execution of the
current web request. Please review the stack trace for more information
about the error and where it originated in the code. 

Exception Details: System.IO.FileLoadException: Could not load file or
assembly 'ServerTime' or one of its dependencies. The located assembly's
manifest definition does not match the assembly reference. (Exception from
HRESULT: 0x80131040)

Source Error: 

An unhandled exception was generated during the execution of the current
web request. Information regarding the origin and location of the exception
can be identified using the exception stack trace below.  

Assembly Load Trace: The following information can be helpful to determine 
why the assembly 'ServerTime' could not be loaded.


WRN: Assembly binding logging is turned OFF.
To enable assembly bind failure logging, set the registry value 
[HKLM\Software\Microsoft\Fusion!EnableLog] (DWORD) to 1.

Note: There is some performance penalty associated with assembly bind 
failure logging.

To turn this feature off, remove the registry value 
[HKLM\Software\Microsoft\Fusion!EnableLog].

public void populate_menu()
{
    DataSet ds = GetMenuData();
    foreach(DataRow drow in ds.Tables["CATEGORY"].Rows)
    {
        MenuItem masteritem = new MenuItem((string)drow["category_name"]);
        name = masteritem.Text;
        get_id();
        par_id = Convert.ToInt32 (ViewState["p_id"]);
        if (par_id == 0)
        {
            Menu1.Items.Add(masteritem);
        }
        else
        {
            //now find the category whose category_id is par_id
            get_category_name();
            ca_name = ViewState["cname"].ToString();

            //get the menu index where category name is "ca_name"


            //then under that category, add this sub category
            Menu1.Items[0].ChildItems.Add(masteritem);
        }
    }
}