How to make using DevExpress:
1. TreeView based on the database?
2. TreeView was synchronized with the database?
Changed the contents of the line -> the database was updated.
Dragged the subordinate line to another node -> the database was updated.
3. In order to drag-and-drop the TreeView elements between nodes.
How to solve all the problems with the help of "designer" or programming.
On the "1" question, I realized that we need to create a TreeList, and then set the TreeList.ViewStyle property to TreeView.
So it is written in the documentation
I created the TreeList.
Where can I change the property TreeList.ViewStyle?
How to make a TreeView?
Project - link
Please take a look at the How to make the TreeList control look like a TreeView example which illustrates how to achieve your goal.
Check the TreeList's TreeView Style documentation and you can change the view by setting TreeList.ViewStyle Property
Example:
private void Form1_Load(object sender, EventArgs e) {
treeList1.ForceInitialize();
treeList1.Appearance.FocusedCell.BackColor = System.Drawing.SystemColors.Highlight;
treeList1.Appearance.FocusedCell.ForeColor = System.Drawing.SystemColors.HighlightText;
treeList1.OptionsBehavior.Editable = false;
treeList1.ViewStyle = DevExpress.XtraTreeList.TreeListViewStyle.TreeView;
}