C# WinForm 读写XML文件

        建立一个WinForm应用程序 添加MenuStrip控件，填写两个功能“读取” 和“导出数据”。

        用了两个DataSet控件和对话框“打开(OpenFilesDialog控件)"和"保存(SaveFilesDialog控件)"

        读取                  private void 读取ToolStripMenuItem_Click(object sender, EventArgs e)
                {
                     if (opFileDlg .ShowDialog() == DialogResult.OK)
                    {
                         if(opFileDlg .OpenFile()!=null)
                         {
                             twoXML .ReadXml (@opFileDlg .FileName );
                             foreach (DataRow twoRow in twoXML .Tables ["user"].Rows)
                             {
                                DataRow newRow = dsXML.Tables["user"].NewRow();
                                newRow ["序号"]  = twoRow ["序号"];
                                newRow["标题"] = twoRow["标题"];
                                newRow["网址"] = twoRow["网址"];
                                newRow["用户名"] = twoRow["用户名"];
                                newRow["密码"] = twoRow["密码"];
                                newRow["时间"] = twoRow["时间"];
                                newRow["备注"] = twoRow["备注"];
                                dsXML .Tables ["user"].Rows .Add(newRow);
                             }
                             int n = dsXML .Tables ["user"].Rows .Count ;
                             for(int i=0;i<n;i++)
                             {
                                 dsXML .Tables ["user"].Rows [i]["序号"]=i+1;
                             }
                             dsXML.WriteXml(@"user.xml");
                             this.Visible = true;
                             MessageBox.Show("数据导入成功！", "成功");
                         }
                    }
                    else
                    {
                       this.Visible  = true;
                    }
                }
        导出

                private void 导出ToolStripMenuItem_Click(object sender, EventArgs e)
                {
                    if (svFileDlg.ShowDialog() == DialogResult.OK)
                    {
                        dsXML.WriteXml(@svFileDlg.FileName);
                        this.Visible = true;
                        MessageBox.Show("数据导出成功！", "成功");
                    }
                    else
                    {
                       this.Visible  = true;
                    }
                }