Layout with the Dock property of the control in C#winform

To implement the following layout, you can achieve the effect by setting the Dock property of the control

1. Drag and drop a panel control into a label control (placed in a panel) and a TreeView control into Testform

2. Set the Dock property of the panel to Top(Set the BorderStyle property to FixedSingle, which looks nice), set the Dock property of the TreeView to Fill

3. It is important to note that the panel is placed in the Testform first , and the TreeView is then obscured by the panel that is placed after the testform is filled with the TreeView, as shown below

4. To achieve a similar layout (such as left and right layout, left unchanged), you can use this method

5. Alternatively, you can use the SplitContainer control to implement a similar layout