Hi,
try this
<asp:Repeater ID="Rep" runat="server" OnItemDataBound="rep_ItemDataBound">
<ItemTemplate>
<table width="100%">
<tr>
<td valign="top" width="13%" align="left">
<asp:DropDownList ID="Dropdown1" runat="server" Width="80px">
</asp:DropDownList>
</tr>
</ItemTemplate>
<FooterTemplate>
</table>
</FooterTemplate>
</asp:Repeater>
//in the code behind section
in the repDataBound Event find that drop down and bind it
DropDownList myDD = (DropDownList)e.Item.FindControl("Dropdown1");
myDD.DataTextField = "Name";
myDD.DataValueField = "Id";
myDD.DataBind();