test.cs

public void ClearTableStyle(Table table, TextControl textControl)
{
  var cellFormat = new TXTextControl.TableCellFormat();

  // clear all row formats
  foreach (TableRow row in table.Rows)
  {
    // apply each property of cellFormat to the row by using reflection
    foreach (var property in cellFormat.GetType().GetProperties())
    {
      property.SetValue(row.CellFormat, property.GetValue(cellFormat));
    }
  }

  table.Select();
  textControl.Selection.ForeColor = Color.Black;
}