C# word画表格外边框加粗

ArrayList TableList = new ArrayList();

Microsoft.Office.Interop.Word.Table objTable_QDC = _WordEditor.AddTable(tableList[i].ToString(),  2, 4);

  //给表格外边框设置宽度
 objTable_QDC.Borders.OutsideLineWidth = WdLineWidth.wdLineWidth150pt;