how to get multiple value inside item template in gridview and pass it to another page

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hi friends

there is a item template in my gridview where in item template there is a textbox..
in textbox some values are displaying but not from database it can be changed dynamicaly by the user


my question is how to get the values inserted by the user in each row and display in another gridview in another page....

<asp:GridView ID="GridView1" runat="server" ShowHeader="False" Width="577px" EmptyDataText="There is Nothing in your Gridview"
            AutoGenerateColumns="False" BackColor="White" BorderColor="White" BorderStyle="Ridge"
            BorderWidth="2px" CellPadding="5" CellSpacing="1" GridLines="None" 
            OnRowCommand="GridView1_RowCommand" DataKeyNames="ProductId" 
            onselectedindexchanging="GridView1_SelectedIndexChanging">
            <rowstyle backcolor="#DEDFDE" forecolor="Black" cssclass="gg" />
            <columns>
               
                <asp:BoundField DataField="ProductName" SortExpression="ProductName" />
                <asp:BoundField DataField="ProductLogDesc" SortExpression="ProductLogDesc" />
                <asp:BoundField DataField="ProductCost" SortExpression="ProductCost" />
              
                <asp:TemplateField>
                    <itemtemplate>
                        <asp:TextBox ID="txtQuantity" Columns="5" Text='<%# Eval("Quantity") %>' runat="server">
                        <asp:LinkButton runat="server" ID="btnRemove" Text="Remove" CommandName="Remove"
                            CommandArgument='<%# Eval("ProductId") %>' Style="font-size: 12px;">
                    </itemtemplate>
                
            </columns>
            <footerstyle backcolor="#C6C3C6" forecolor="Black" />
            <pagerstyle backcolor="#C6C3C6" forecolor="Black" horizontalalign="Right" />
            <SelectedRowStyle BackColor="#9471DE" Font-Bold="True" ForeColor="White" />
            <HeaderStyle BackColor="#4A3C8C" Font-Bold="True" ForeColor="#E7E7FF" />