files and folder retrieval error

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C#

Hello sir... may i ask how can i retrieve a lists of directories using c#? i was able to build my treeview and retrieve all the files and folders in my flash drive but when i try to retrieve all files in drive c: or drive d: it gives me an error since i was trying to open a restricted folder such as system volume and other folder that has a restriction to open... when i loop and when i encounter that kind of folder i will just skip it and not retrieve the folder name is that possible? please help me with this... thanks in advance...

I have this Error when i try to run my code of retrieving the folder this are the error

A first chance exception of type 'System.UnauthorizedAccessException' occurred in mscorlib.dll
A first chance exception of type 'System.UnauthorizedAccessException' occurred in mscorlib.dll
Access to the path 'D:\$RECYCLE.BIN\S-1-5-21-3717064836-2505550092-2449041842-1014\' is denied.
Access to the path 'D:\ae1a6083e25e839c285e48eaaff1ee\' is denied.
A first chance exception of type 'System.UnauthorizedAccessException' occurred in mscorlib.dll
Access to the path 'D:\System Volume Information\' is denied.

this is the code for listing all folder

public void listDirectories(string path, TreeNode m) {
            System.IO.DirectoryInfo dir = new System.IO.DirectoryInfo(path);
            TreeNode Main = m;
            Main.Tag = "";
            foreach (System.IO.DirectoryInfo g in dir.GetDirectories())
            {
                
                try
                {
                    //LOAD FOLDERS
                    TreeNode MainNext = Main.Nodes.Add(g.Name);
                    MainNext.Tag = (g.Name);
                    listDirectories(g.FullName, MainNext);
                }catch(Exception e){
                    MessageBox.Show("Error in folders "  +  e.Message);
                    Console.WriteLine(e.Message);

                }
                
            } 
        
        }

This will list the files inside each folders

public void listFiles(string location) {
       //     MessageBox.Show(location);
            System.IO.DirectoryInfo dir = new System.IO.DirectoryInfo(location);
            try
            {
                foreach (System.IO.FileInfo f in dir.GetFiles("*.*"))
                {
                    try
                    {
                        //LOAD FILES
                        ListViewItem lSingleItem = listView1.Items.Add(f.Name);
                        //SUB ITEMS
                        lSingleItem.SubItems.Add(Convert.ToString(f.Length));
                        lSingleItem.SubItems.Add(f.Extension);
                    }
                    catch (Exception e)
                    {
                        MessageBox.Show("Error in files " + e.Message);
                    }
                }
            }
            catch (Exception e)
            {
                MessageBox.Show("Error in files " + e.Message);
                Console.WriteLine(e.Message);
            }
        
        }