Bind data in Dropdown list into gridview coloumn

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ASP.NET

SQL

server

Hii i have a dropdownlist in gridview coloum.
I wants to add values in dropdownlist from database..!!
how can i do it?plzz tell me..
Gridview code is below??

<asp:GridView ID="GridView2" runat="server" AutoGenerateColumns="False" 
                    DataSourceID="SqlDataSource1">
                    

<Columns> 
<asp:TemplateField HeaderText="Product_ID"> 
<ItemTemplate> 
<asp:Label id="idlbl" runat="server" Text='<%#DataBinder.Eval(Container.DataItem,"id")%>' > 
</asp:Label> 
</ItemTemplate> 
</asp:TemplateField> 

<asp:TemplateField HeaderText="Product_Name"> 
<ItemTemplate> 
<asp:Label id="idlbl" runat="server" Text='<%#DataBinder.Eval(Container.DataItem,"id")%>' > 
</asp:Label> 
</ItemTemplate> 
</asp:TemplateField> 

<asp:TemplateField HeaderText="Product_Image"> 
<ItemTemplate> 
<asp:Label id="idlbl" runat="server" Text='<%#DataBinder.Eval(Container.DataItem,"id")%>' > 
</asp:Label> 
</ItemTemplate> 
</asp:TemplateField> 


<asp:TemplateField HeaderText="Product_Qty"> 
<ItemTemplate> 
<asp:DropDownList ID="ddl" runat ="server" DataTextField ="Product_Qty" DataValueField ="id" DataSourceID ="SqlDataSource1" > 
</asp:DropDownList> 
</ItemTemplate> 
</asp:TemplateField>

<asp:TemplateField HeaderText="Product_Rates"> 
<ItemTemplate> 
<asp:Label id="idlbl" runat="server" Text='<%#DataBinder.Eval(Container.DataItem,"id")%>' > 
</asp:Label> 
</ItemTemplate> 
</asp:TemplateField> 

</Columns>

</asp:GridView>

Database table is...below and i wants to add Product_Size Values into Dropdownlist.

CREATE TABLE [dbo].[Productmaster](
[product_Id] [int] IDENTITY(1,1) NOT NULL,
[product_Name] [nvarchar](max) NOT NULL,
[product_Image] [nvarchar](max) NOT NULL,
[product_Size] [int] NOT NULL,
[product_Rate] [int] NOT NULL,
CONSTRAINT [PK_Productmaster] PRIMARY KEY CLUSTERED
(
[product_Id] ASC
)