Make an order by GridView

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C#2.0

C#

ASP.NET

Gridview

Hi,
Good Morning

I am creating a order by a grid here. I want to use a button that is available outside from grid. On clicking of this button, the grid creates a row and there are four column dropdown list(item_name),label display rate,textbox for insert quantity,again label for display total amount for that item. After that again display new row until user make all entry for required item.
Finally a button outside of grid is submit. On clicking this button I want to save all values in database.

I have created dropdown but there are add button inside gridview when I click this button all item list display in grid means if in my item master have five item then grid displaying all five row at a time.

How can I complete this task?

What I did, I shared with you. Below is my gridview that is bound with sql-database and dropdown is polpulating item name and rate label display on selection of item name textbox accept quantity from user input last column calculate amount.

<telerik:RadGrid ShowFooter="true" ID="radGrid1" runat="server" OnInsertCommand="radGrid1_InsertCommand"
           AutoGenerateColumns="False" GridLines="None" AllowMultiRowEdit="True" AllowAutomaticInserts="true"
           OnItemDataBound="radGrid1_ItemDataBound" OnNeedDataSource="radGrid1_NeedDataSource">
           <MasterTableView AutoGenerateColumns="false" EditMode="InPlace" PageSize="5" ShowFooter="false"
               CommandItemDisplay="Top" OnPreRender="radGrid1_PreRender">
               <Columns>
                   <telerik:GridTemplateColumn HeaderText="Product Name" UniqueName="Product_Name">
                       <ItemTemplate>
                           <asp:DropDownList ID="ddl1" runat="server" AutoPostBack="true" DataTextField="product_Name"
                               DataValueField="product_Name" OnSelectedIndexChanged="ddl1_SelectedIndexChanged">
                           </asp:DropDownList>
                       </ItemTemplate>
                   </telerik:GridTemplateColumn>
                   <telerik:GridTemplateColumn HeaderText="Product_rate">
                       <ItemTemplate>
                           <asp:Label ID="lblrate" runat="server"></asp:Label>
                       </ItemTemplate>
                   </telerik:GridTemplateColumn>
                   <telerik:GridTemplateColumn HeaderText="Product Quantity">
                       <ItemTemplate>
                           <asp:TextBox ID="txtQuantity" runat="server" />
                       </ItemTemplate>
                   </telerik:GridTemplateColumn>
                   <telerik:GridTemplateColumn HeaderText="Product Amount">
                       <ItemTemplate>
                           <asp:Label ID="lblAmount" runat="server" />
                       </ItemTemplate>
                       <FooterTemplate>
                           <asp:Button ID="btn1" runat="server" Text="Add New Item" OnClick="btn1_click" />
                       </FooterTemplate>
                   </telerik:GridTemplateColumn>

               </Columns>
           </MasterTableView>
       </telerik:RadGrid>