table.cs

public static class TableExtender {
   public static void RemoveEmptyColumns(this Table table) {
      List<TableColumn> columns = new List<TableColumn>();

      foreach (TableColumn col in table.Columns) {

         bool foundText = false;

         foreach (TableRow row in table.Rows) {

            if (row.IsHeader == true) continue;

            if (table.Cells[row.Row, col.Column].Text != "") {
               foundText = true; break;
            }

         }

         if (!foundText) { columns.Add(col); }
      }

      foreach (TableColumn column in columns) {
         table.Cells[1, column.Column].Select();
         table.Columns.Remove();
      }
   }
}