Get the MenuName and Url from the database into a datatable.
Then do something like this:
for (int count = 0; count < datatable.Rows.Count; count++)
{
MenuItem mnuLinkItem = new MenuItem();
mnuLinkItem.Text = datatable.Rows[count][0].ToString();
mnuLinkItem.NavigateUrl = datatable.Rows[count][1].ToString();
mnuMainMenu.Items.Add(mnuLinkItem);
}