C#如何关闭word进程

//获取文件目录
           string fileName = @"filename";

            //开始转换
            //生成操作对象
            Microsoft.Office.Interop.Word.Application word = new Microsoft.Office.Interop.Word.ApplicationClass();
            Microsoft.Office.Interop.Word.Documents documents =word.Documents;
            Type wordType = word.GetType();
            Type docType = documents.GetType();

            //打开文件
            Microsoft.Office.Interop.Word.Document document = (Microsoft.Office.Interop.Word.Document)
                docType.InvokeMember("Open", System.Reflection.BindingFlags.InvokeMethod, null, (object)documents, new Object[] { fileName, true, true });
wordType.InvokeMember("Quit", System.Reflection.BindingFlags.InvokeMethod, null, word, null);

foreach (System.Diagnostics.Process p in System.Diagnostics.Process.GetProcessesByName("WINWORD")) {
                p.Kill();
            }