Gridview Pageindexchanging event doubt

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ASP.NET

Scenario

--I have a drop down
--On select changed event of drop down ...grid populates....allow paging is made true
--When i navigate to second page i get error

Microsoft Jscript Runtime error:
system.webform.pagerequestmanagerservererrorexception :
The gridview 'GridzeroApprovedKm' fired event PageIndexChanging which wasnt handled.


-----------------------------------------------aspx page------------------------------

<asp:GridView ID="GridZeroApprovedKm" AllowPaging="true" runat="server" AutoGenerateColumns="false"
                    DataKeyNames="Address_id" OnRowCancelingEdit="GridZeroApprovedKm_RowCancelingEdit"
                    OnRowDataBound="GridZeroApprovedKm_RowDataBound" OnRowDeleting="GridZeroApprovedKm_RowDeleting"
                    OnRowEditing="GridZeroApprovedKm_RowEditing"
                    OnRowUpdating="GridZeroApprovedKm_RowUpdating"
                    onpageindexchanging="GridZeroApprovedKm_PageIndexChanging">

-------------------Code Behind - Populating the GridView -----------------------------
--here the grid popultes

protected void ddlhub_SelectedIndexChanged(object sender, EventArgs e)
        {

            TMS.Business.INT_ApprovedKm ApprovedKmObjdis = new TMS.Business.INT_ApprovedKm();
            DataSet Approveddata = new DataSet();
            Approveddata = ApprovedKmObjdis.GetZeroApprovedKm(ddlhub.SelectedValue);
            GridZeroApprovedKm.DataSource = Approveddata;
            GridZeroApprovedKm.DataBind();

        }

----------------------PageIndexChange Event Handler of GridView----------------

protected void GridZeroApprovedKm_PageIndexChanging(object sender, GridViewPageEventArgs e)
      {
          GridZeroApprovedKm.PageIndex= e.NewPageIndex;
          TMS.Business.INT_ApprovedKm ApprovedKmObjdis = new TMS.Business.INT_ApprovedKm();
          DataSet Approveddata = new DataSet();
          Approveddata = ApprovedKmObjdis.GetZeroApprovedKm(ddlhub.SelectedValue);
          GridZeroApprovedKm.DataSource = Approveddata;
          GridZeroApprovedKm.DataBind();


      }

Again I am trying to populate the grid by writing the above code.

Where i am doing wrong ?

---what i understand is

when i navigate to next page. the dropdown is having "select" but not the value that is selected in first page.

--so that may be the reason why its not working

--if this is the problem....then when i navigate to next page....the drop down should be selected as it was selected as in first page...so that the selected change event will fire and the grid will populate

--correct me if i am wrong

--also please tell me how to solve this


--this is my page load event

protected void Page_Load(object sender, EventArgs e)
      {

          try
          {

              if (!Page.IsPostBack)
              {

                  ControlBinding.FillCombo(ddlhub, "HUB_MASTER", Session[TMS.Common.CommonConstants.CONST_COMPANY_ID].ToString(), Session[TMS.Common.CommonConstants.CONST_USER_HUB_ID].ToString(), Session[TMS.Common.CommonConstants.CONST_USER_ID].ToString(), "", "", "", false);
              }
              for (int count = 0; count < ddlhub.Items.Count; count++)
              {
                  ddlhub.Items[count].Attributes.Add("title", ddlhub.Items[count].Text);
              }
          }

          catch (Exception ex)
          {

              LogError.WriteError(ex);
          }
          finally
          {

          }
      }

--update panel i am using in aspx page

<asp:UpdatePanel ID="UpdatePanel1" UpdateMode="Conditional" runat="server">
            <ContentTemplate>
                <asp:GridView ID="GridZeroApprovedKm" AllowPaging="true" runat="server" AutoGenerateColumns="false"
                    DataKeyNames="Address_id" OnRowCancelingEdit="GridZeroApprovedKm_RowCancelingEdit"
                    OnRowDataBound="GridZeroApprovedKm_RowDataBound" OnRowDeleting="GridZeroApprovedKm_RowDeleting"
                    OnRowEditing="GridZeroApprovedKm_RowEditing"
                    OnRowUpdating="GridZeroApprovedKm_RowUpdating"
                    onpageindexchanging="GridZeroApprovedKm_PageIndexChanging">
                    <SelectedRowStyle CssClass="ResultSelectedRow" BackColor="Cyan" />
                    <Columns>
                        <asp:TemplateField HeaderText="Select All">
                            <HeaderTemplate>
                                <asp:CheckBox ID="chkb1" runat="server" Text="Select All" OnCheckedChanged="sellectAll"
                                    AutoPostBack="true" />
                            </HeaderTemplate>
                            <ItemStyle HorizontalAlign="Center" VerticalAlign="Middle" />
                            <ItemTemplate>
                                <asp:CheckBox ID="chkb2" runat="server" OnCheckedChanged="sellectAllChildcheckbox" Text="Select" AutoPostBack="true" />
                            </ItemTemplate>
                            <ItemStyle HorizontalAlign="center" />
                        </asp:TemplateField>
                        <asp:TemplateField HeaderText="Hub Name">
                            <ItemTemplate>
                                <asp:Label ID="lbladdressid" runat="server" Visible="false" Text='<%#Eval("Address_Id") %>'></asp:Label>
                                <asp:Label ID="lblhubname" runat="server" Visible="true" Text='<%#Eval("hub_name") %>'></asp:Label>
                            </ItemTemplate>
                            <ItemStyle HorizontalAlign="center" />
                        </asp:TemplateField>
                        <asp:TemplateField HeaderText="Location">
                            <ItemTemplate>
                                <asp:Label ID="lblgeocodeaddress" runat="server" Visible="true" Text='<%#Eval("geocode_address") %>'></asp:Label>
                            </ItemTemplate>
                            <ItemStyle HorizontalAlign="center" />
                        </asp:TemplateField>
                        <asp:TemplateField HeaderText="Approved Km By Ops">
                            <ItemTemplate>
                                <asp:TextBox ID="txtdistanceops" MaxLength="6" CssClass="textBox_for6tds" runat="server">  </asp:TextBox>
                                <asp:RegularExpressionValidator ID="revtxtdistanceops" runat="server" Display="Static"
                                    SetFocusOnError="True" ValidationExpression="[0-9]*\.?[0-9]*" ControlToValidate="txtdistanceops"></asp:RegularExpressionValidator>
                            </ItemTemplate>
                            <ItemStyle HorizontalAlign="center" />
                        </asp:TemplateField>
                        <asp:TemplateField HeaderText="Approved Km By CTV" Visible="false">
                            <ItemTemplate>
                                <asp:TextBox ID="txtdistancectv" MaxLength="6" CssClass="textBox_for6tds" runat="server">  </asp:TextBox>
                                <asp:RegularExpressionValidator ID="revtxtdistancectv" runat="server" Display="Static"
                                    SetFocusOnError="True" ValidationExpression="[0-9]*\.?[0-9]*" ControlToValidate="txtdistancectv"></asp:RegularExpressionValidator></ItemTemplate>
                            <ItemStyle HorizontalAlign="center" />
                        </asp:TemplateField>
                    </Columns>
                </asp:GridView>
            </ContentTemplate>
        </asp:UpdatePanel>
    </div>
    <asp:ValidationSummary ID="ValidationSummary1" runat="server" HeaderText="You must enter the Numeric Value:"
        ShowMessageBox="True" ShowSummary="False" Style="position: static" />