方法一
//Configuration config = ConfigurationManager.OpenExeConfiguration(ConfigurationUserLevel.None); //获取AppSettings的节点
//AppSettingsSection appsection = (AppSettingsSection)config.GetSection("appSettings");
//this.txtYwlb.Text = appsection.Settings["YWLX"].Value;
方法二
string DesfilePath = ConfigurationManager.AppSettings["DesfilePathName"];