C# - Reuse A Dropdownlist Each Row Of A Table Instead Of Rebuilding It?

I have a table the uses the same dropdown list in each row. I thought that I could just create one dropdown list and then reuse it in each new row, but the table only ends up with one row unless I create "new" dropdownlist. Am I approaching this all wrong? In the interest of efficiency, is there a way to build the list once and then reuse it by creating another instance of it or something? I was trying to avoid rebuilding that list umpteen times.

private void UserRoles()
{
Table table = MakeTable();
Ewo.sqlDataStore.Administrator sql = new Ewo.sqlDataStore.Administrator();
DataSet dataset =sql.SiteUserRoleList();
DropDownList sel = RoleList(dataset.Tables[0]);
if(tools.validDataSet(dataset))
{
if (dataset.Tables.Count > 1)//existing roles are #2, show the roles the user is part of
{
foreach (DataRow dRow in dataset.Tables[1].Rows)
{
table.Rows.Add(CreateRoleRow(Convert.ToString(dRow["SitePageGroupName"]), sel));//add a row with data
}
}
table.Rows.Add(CreateRoleRow(sel));//add a blank row on the bottom
}
AdminSiteUerRoles.Controls.Add(table);//add it all to the page
}