i worte code for BInd data to dropdownlist in gridview

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ASP.NET

C#3.5

Dear Experts ,
plz help me about my code..
I tried sooo lot but i am not getting ..

plz suggest me the c# code...
my design code is..
source code.

<asp:UpdatePanel ID="UpdatePanel1" runat="server">
        <ContentTemplate>
            <table >
                <tr>
                    <td>
                        <asp:Panel ID="pnlSearchJobType" runat="server" GroupingText="Filter">
                            <table width="100%">
                                <tr>
                                    <td width="100">
                                        &nbsp;
                                    </td>
                                    <td width="150">
                                        Job Type
                                    </td>
                                    <td width="20">
                                        :
                                    </td>
                                    <td>
                                                                        <asp:DropDownList ID="ddlobype" runat="server"
                                    AppendDataBoundItems="True" Width="135px" SkinID="DDListNormal">
                                    <asp:ListItem Selected="True" Value="-1">--- ALL ---</asp:ListItem>
                                </asp:DropDownList>
                                    </td>
                                    <td align="right" width="100">
                                        <asp:Button ID="btnSearch" runat="server"
                                            Text="Search" Height="26px" />
                                    </td>
                                    <td width="100">
                                    </td>
                                </tr>
                            </table>
                        </asp:Panel>
                    </td>
                </tr>
                <tr>
                    <td>
                        <asp:Panel ID="Panel1" runat="server" Width="100%"  GroupingText="Job Type List">
                            <asp:GridView ID="gvJobType" runat="server" AllowPaging="True" AutoGenerateColumns="False"
                                DataSourceID="objDsJobType" SkinID="SkinGrid" Width="100%" OnPageIndexChanging="gvJobType_PageIndexChanging"

                                OnRowDataBound="gvJobType_RowDataBound">
                                <Columns>

                                    <asp:TemplateField HeaderText="JobTypeId" InsertVisible="False" SortExpression="JobTypeId"
                                        Visible="False">
                                        <ItemTemplate>
                                            <asp:Label ID="lblItemJobTypeId" runat="server" Text='<%# Bind("JobTypeId") %>'></asp:Label>
                                        </ItemTemplate>

                                    </asp:TemplateField>
                                    <asp:TemplateField HeaderText="Job Type" SortExpression="JobType">
                                        <ItemTemplate>
                                            <asp:Label ID="lblItemJobType" runat="server" Text='<%# Bind("JobType") %>'></asp:Label>
                                        </ItemTemplate>

                                        <ItemStyle Width="200px" />
                                    </asp:TemplateField>
                                    <asp:TemplateField HeaderText="Job Description" SortExpression="JobDescription">
                                        <ItemTemplate>
                                            <asp:Label ID="lblItemDescription" runat="server" Text='<%# Bind("JobDescription") %>'></asp:Label>
                                        </ItemTemplate>

                                    </asp:TemplateField>
                                </Columns>
                                <EmptyDataTemplate>
                                    &#160;&#160; No Records found...
                                </EmptyDataTemplate>
                            </asp:GridView>
                        </asp:Panel>
                        <tr>
                            <td>

                            </td>
                        </tr>
            </table>
            <asp:ObjectDataSource ID="objDsJobType" runat="server"
                SelectMethod="GetJobTypeDetails"  UpdateMethod="UpdateJobType"
                OldValuesParameterFormatString="{0}">
                <DeleteParameters>
                    <asp:Parameter Name="JobTypeId" Type="Int32" />
                </DeleteParameters>
                <UpdateParameters>
                    <asp:Parameter Name="JobTypeId" Type="Int32" />
                    <asp:Parameter Name="JobType" Type="String" />
                    <asp:Parameter Name="JobDescription" Type="String" />
                </UpdateParameters>
            </asp:ObjectDataSource>
        </ContentTemplate>
    </asp:UpdatePanel>