test.cs

public void ApplyTableStyle(Table table, TableStyle tableStyle)
{
  // loop through rows and check for header row
  foreach (TableRow row in table.Rows)
  {
    if (row.IsHeader)
    {
      row.CellFormat = tableStyle.HeaderRowFormat;
    }
    else
    {
      row.CellFormat = tableStyle.TableRowFormat;
    }
  }
}