<asp:Repeater ID="rpProducts" runat="server">
<ItemTemplate>
     <td> <div class="btn-ud" ><a href="<%#Eval("ProductID") %>" data-toggle="modal" data-target="#myModal2" class="btn btn-custom-3 btn-sm"/ >Detay</a> </div> </td>
</ItemTemplate>
</asp:Repeater>

<div class="modal fade" id="myModal2" tabindex="-1" role="dialog" aria-hidden="true">
<asp:Repeater ID="rpProductDetails" runat="server">
<ItemTemplate>
<tbody>
<td height="100px"> <%#Eval("ProductDetails")%> </td>
<td height="100px">  <%#Eval("ProductDetails")%> </td>
</tbody>
</ItemTemplate>
</asp:Repeater>
</div>

DataTable dtProductsDetails = system.GetDataTable("Select p.*, c.CategoryName, sc.CategoryName as SubCategoryName from TBLPRODUCTS p left join TBLCATEGORIES c on p.CategoryID = c.CategoryID left join TBLCATEGORIES sc on c.SubCategoryID = sc.CategoryID where p.ProductID = ProductID");
          if (dtProductsDetails.Rows.Count > 0)
          {
              rpProductDetails.DataSource = dtProductsDetails;
              rpProductDetails.DataBind();
          }