List of files and folders of a directory using c# windows

Use the System.IO.Directory.GetFiles[^] and GetDirectories[^] methods to retrieve the information.
Then you can display it in a DataGridView[^] just like any other pile of strings.

MyDataGridView.Rows[whateverRowNumber].Columns["ChildFolderNameColumn"].Value = childFolderName;

Or you can store your data in a BindingList[^] and bind it to the DataGridView.
Depending on your very situation, it can be less hassle than the first option.

private void btnGetFolders_Click(object sender, EventArgs e)
        {
            string[] dirs = Directory.GetDirectories(@"DirectoryPath eg. E:\Music");
            
            foreach (string dir in dirs)
            {
                lstMusic.Items.Add(dir); //Adding the list of files and folders to a listbox called lstMusic           
            }

        }