how to add a new row in gridview ?

<telerik:RadGrid ID="gridInvLines" AllowMultiRowSelection="true" AllowMultiRowEdit="true"
 
Skin="Office2007" runat="server" AllowAutomaticDeletes="True" AllowAutomaticInserts="True"
 
Width="100%" PageSize="14" AllowAutomaticUpdates="True" AllowPaging="True" AutoGenerateColumns="False"
 
DataSourceID="odsInvLines" ShowStatusBar="true" EnableAJAX="true" EnableAJAXLoadingTemplate="true"
 
LoadingTemplateTransparency="50">
 
<PagerStyle Mode="Slider" />
 
<ClientSettings>
 
<Selecting AllowRowSelect="true" />
 
</ClientSettings>
 
<MasterTableView CommandItemDisplay="Top" DataKeyNames="LINE_NUMBER" DataSourceID="odsInvLines"
 
EditMode=InPlace" AutoGenerateColumns="False" Width="100%">
 
<Columns>
 
 
<telerik:GridEditCommandColumn ButtonType="ImageButton" UpdateText="Save" CancelText="Cancel"
 
UniqueName="EditColumn">
 
<HeaderStyle Width="20px" />
 
<ItemStyle HorizontalAlign="Center" />
 
</telerik:GridEditCommandColumn> 
 
 
<telerik:GridTemplateColumn>
 
<ItemStyle HorizontalAlign="Center" />
 
<ItemTemplate>
 
<a href="">Copy</a>
 
</ItemTemplate>
 
</telerik:GridTemplateColumn>
 
 
<telerik:GridBoundColumn DataField="LINE_NUMBER" HeaderText="Line Number" 
 
UniqueName="LINE_NUMBER" ReadOnly="True">
 
<HeaderStyle Width="30px" />
 
<ItemStyle HorizontalAlign="Center" />
 
</telerik:GridBoundColumn> 
 
 
<telerik:GridTemplateColumn EditFormColumnIndex="2" HeaderText="Line Description" HeaderStyle-HorizontalAlign="center" ItemStyle-HorizontalAlign="Left">
 
<ItemTemplate >
 
<asp:Label runat="server" Text='<%# DataBinder.Eval(Container.DataItem, "DESCRIPTION") %>'>
 
</asp:Label>
 
</ItemTemplate>
 
<EditItemTemplate>
 
<asp:TextBox ID="Label1" runat="server" TextMode="MultiLine" Rows="4" Text='<%# Bind("DESCRIPTION") %>' />
 
</EditItemTemplate>
 
</telerik:GridTemplateColumn> 
 
 
<telerik:GridTemplateColumn HeaderText="Activity Code" >
 
<ItemTemplate>
 
<asp:Label ID="lblActivityCode" runat="server" Text='<%# DataBinder.Eval(Container.DataItem, "ACTIVITY_CODE_DESC") %>'>
 
</asp:Label>
 
</ItemTemplate>
 
 
<EditItemTemplate >
 
<telerik:RadComboBox ID="RadComboBox1" runat="server" Width="100px" Height="200px"
 
AllowCustomText="False" ShowToggleImage="True" ShowMoreResultsBox="false" 
 
EnableLoadOnDemand="True" DropDownWidth="500px" DataTextField="DESCRIPTION" DataSource='<%# LoadActivityCodes() %>' 
 
MarkFirstMatch="True" OnClientItemsRequesting="" AutoPostBack="true" Skin="Office2007">
 
<HeaderTemplate>
 
<table style="width: 500px" cellspacing="0" cellpadding="0">
 
<tr>
 
<td style="width: 200px;">
 
Description</td>
 
<td style="width: 60px;">
 
Account</td>
 
<td style="width: 200px;">
 
Category</td>
 
</tr>
 
</table>
 
</HeaderTemplate>
 
 
<ItemTemplate>
 
<table style="width: 500px" cellspacing="0" cellpadding="0">
 
<tr>
 
<td style="width: 200px;">
 
<%# DataBinder.Eval(Container.DataItem,"DESCRIPTION")%>
 
</td>
 
<td style="width: 60px;">
 
<%# DataBinder.Eval(Container.DataItem, "ACCOUNT")%>
 
</td>
 
<td style="width: 200px;">
 
<%# DataBinder.Eval(Container.DataItem,"CATEGORY")%>
 
 
</td>
 
</tr>
 
</table>
 
</ItemTemplate>
 
</telerik:RadComboBox>
 
</EditItemTemplate>
 
</telerik:GridTemplateColumn>
 
 
 
<telerik:GridBoundColumn DataField="QUANTITY" HeaderText="Quantity" 
 
EditFormColumnIndex="1" UniqueName="QUANTITY">
 
<HeaderStyle Width="30px" />
 
<ItemStyle HorizontalAlign="Center" />
 
 
</telerik:GridBoundColumn> 
 
<telerik:GridBoundColumn DataField="UNIT_SELLING_PRICE" EditFormColumnIndex="1" HeaderText="Amount" DataFormatString="{0:c}">
 
<HeaderStyle Width="50px" />
 
<ItemStyle HorizontalAlign="Right" />
 
</telerik:GridBoundColumn>
 
 
<telerik:GridBoundColumn DataField="TOTAL_AMOUNT" HeaderText="Total Amount" DataFormatString="{0:c}" >
 
<HeaderStyle Width="50px" />
 
<ItemStyle HorizontalAlign="Right" />
 
</telerik:GridBoundColumn>
 
<telerik:GridCheckBoxColumn DataField="TAXABLE_FLAG" HeaderText="Taxable" 
 
UniqueName="TAXABLE_FLAG" EditFormColumnIndex="1">
 
<HeaderStyle Width="50px" />
 
</telerik:GridCheckBoxColumn>
 
<%-- <asp:TemplateField HeaderText="Taxable">
 
<ItemTemplate>
 
<itemstyle horizontalalign="Center" />
 
<asp:CheckBox ID="TAXABLE_FLAG" runat="Server" Checked='<%# Convert.ToBoolean(DataBinder.Eval(Container.DataItem, "TAXABLE_FLAG")) %>' />
 
</ItemTemplate>
 
</asp:TemplateField>
 
--%>
 
 
<telerik:GridBoundColumn DataField="BEGIN_BILLING_PERIOD" HeaderText="Billing Period Start Date"
 
UniqueName="BEGIN_BILLING_PERIOD" >
 
<HeaderStyle Width="62px" />
 
<ItemStyle HorizontalAlign="Center" />
 
</telerik:GridBoundColumn>
 
 
<telerik:GridBoundColumn DataField="END_BILLING_PERIOD" HeaderText="Billing Period End Date"
 
UniqueName="END_BILLING_PERIOD" >
 
<HeaderStyle Width="62px" />
 
<ItemStyle HorizontalAlign="Center" />
 
</telerik:GridBoundColumn>
 
 
<telerik:GridClientDeleteColumn ConfirmText="Delete this item?" ButtonType="LinkButton" 
 
CommandName="Delete" Text="Delete" UniqueName="DeleteColumn">
 
<HeaderStyle Width="20px" />
 
<ItemStyle HorizontalAlign="Center" />
 
</telerik:GridClientDeleteColumn>
 
 
 
</Columns>
 
<EditFormSettings EditFormType="AutoGenerated" ColumnNumber="2" CaptionDataField="LINE_NUMBER" CaptionFormatString="Edit Line Number:{0}">
 
<FormTableItemStyle Wrap="False"></FormTableItemStyle>
 
<FormCaptionStyle CssClass="EditFormHeader"></FormCaptionStyle>
 
<FormMainTableStyle GridLines="Horizontal" CellSpacing="0" CellPadding="3" BackColor="White"
 
Width="100%" />
 
<FormTableStyle CellSpacing="0" CellPadding="2" CssClass="module" Height="110px"
 
BackColor="White" />
 
<FormTableAlternatingItemStyle Wrap="False"></FormTableAlternatingItemStyle>
 
<EditColumn ButtonType="ImageButton" UpdateText="Save" CancelText="Cancel"
 
InsertText="Insert" 
 
UniqueName="EditCommandColumn1">
 
</EditColumn>
 
<FormTableButtonRowStyle HorizontalAlign="Right" CssClass="EditFormButtonRow"></FormTableButtonRowStyle>
 
</EditFormSettings>
 
</MasterTableView> 
 
</telerik:RadGrid> 
                                              

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<asp:ObjectDataSource ID="odsInvLines" TypeName="ARA.HRPayroll.Common.Users" runat="server"
        OldValuesParameterFormatString="original_{0}" SelectMethod="GetInvoiceLinesByInvoiceID" >
        <UpdateParameters>
        <asp:Parameter Name="Description" Type="String" />
        <asp:Parameter Name="Quantity" Type="String" />
 
        </UpdateParameters>
        <SelectParameters>
            <asp:Parameter Name="UserID" DefaultValue="31592" Type="Int64"  />
            <asp:QueryStringParameter Name="InvoiceID" QueryStringField="invoice_id" Type="Int64" />
        </SelectParameters>
    </asp:ObjectDataSource>
    

                                              

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