Here is how to use C# to scan through files recursively in a computer and add them to a TreeView control. The result will be a C# treeview with folders and files. There are two main functions to accomplish the task. One for scanning directions. The other for creating nodes and child nodes in the TreeView. Both are easily done with recursive C# functions-Here is how to use C# to scan through files recursively in a computer and add them to a TreeView control. The result will be a C# treeview with folders and files. There are two main functions to accomplish the task. One for scanning directions. The other for creating nodes and child nodes in the TreeView. Both are easily done with recursive C# functions..