ASP.NET

 <asp:DropDownList ID="ddl" runat="server"></asp:DropDownList>

ConnectionStringSettingsCollection a = ConfigurationManager.ConnectionStrings;
        ListItem lst = new ListItem();
        foreach (ConnectionStringSettings s in a)
        {
            lst = new ListItem(s.ConnectionString, s.ConnectionString);
            ddl.Items.Add(lst);
        }
        ddl.Items.RemoveAt(0);

<asp:Repeater ID="Repeater1" runat="server"  >
          <HeaderTemplate >
          <table width="100%">
          <tr style="background-color:Black; color:White; font-weight:bold" >
          <td >firstname</td>
          <td >lastname</td>
          <td >dateofbirth</td>
          
          <td ></td>
          </tr>
          </HeaderTemplate>
          <ItemTemplate>
          <tr>
          <td height="30px"><%#DataBinder.Eval(Container.DataItem,"firstname") %></td>
          <td height="30px"><%#DataBinder.Eval(Container.DataItem,"lastname")%></td>
          <td height="30px"><%#DataBinder.Eval(Container.DataItem,"dateofbirth")%></td>
</tr>          
              
          
          </ItemTemplate>
          
          <FooterTemplate>
          </table>
          </FooterTemplate>
          </asp:Repeater>

//Button click Event in page1
// code for checking check box 
then Redirect to 2nd page use query string for id of check box...

//2nd page page load event 
get the values from db by using the id of check box from 1st page