用Csharp读写XML文件，里面包含了读方法，更新方法，增加节点方法，删除方法-Read and write with XML Csharp file, which contains the read method, update method, add node method, delete method

基于winform的图形化的工作流设计器，可添加、修改工作流程图，流程图可保存成XML文件。(csharp development of the graphical workflow designer can be saved into a file flowchart.)