C#创建无标题栏窗体源码，实际上是动态显示或隐藏窗体的标题栏，当隐藏的时候就类似窗体没有了标题栏，当显示标题栏的时候，鼠标按住标题栏即可拖动窗体。-C# create no title bar form source code, is actually the dynamic display or hide the window title bar, when the hidden when similar form no title bar, when the show title bar w