grid view header show even the gridview datasource is empty

<asp:GridView ID="GridView1" runat="server" AutoGenerateColumns="False"
                                DataSourceID="odsAccountOpening" EnableModelValidation="True" Height="135px"
                                Width="942px">
                                <Columns>
                                    <asp:BoundField DataField="AccountNo" HeaderText="Account No"
                                        SortExpression="AccountNo" />
                                    <asp:BoundField DataField="SycDepositTypeId" HeaderText="Deposit Type"
                                        SortExpression="SycDepositTypeId" />
                                        <%--<asp:TemplateField HeaderText="Deposit Type">
                                        <ItemTemplate>
                                            <asp:Label ID="lblDepositType1" runat="server" Text='<%# DataBinder.Eval(Container, "DataItem.SycDepositType.DepositTypeName") %>'></asp:Label>
                                        </ItemTemplate>
                                    </asp:TemplateField>--%>
                                    <asp:BoundField DataField="MamAccountHolderTypeId" HeaderText="Account Type"
                                        SortExpression="MamAccountHolderTypeId" />
                                    <asp:BoundField DataField="InterestRate" HeaderText="Interest Rate"
                                        SortExpression="InterestRate" />
                                    <asp:BoundField DataField="AccountOpenOnBs" HeaderText="A/C Opened On"
                                        SortExpression="AccountOpenOnBs" />
                                    <asp:BoundField DataField="MaturityOn" HeaderText="Maturity On"
                                        SortExpression="MaturityOn" />
                                    <asp:BoundField DataField="MamAccountStatusId" HeaderText=" Account Status "
                                        SortExpression="MamAccountStatusId" />
                                </Columns>
                            </asp:GridView>
                            <asp:ObjectDataSource ID="odsAccountOpening" runat="server"
                                OldValuesParameterFormatString="original_{0}"
                                onobjectcreating="odsAccountOpening_ObjectCreating" SelectMethod="GetAll"
                                TypeName="MemberAccountManagement.BLL.CMamAccountOpening">
                            </asp:ObjectDataSource>