how do you list all files from your computer to a listbox in visual C#?

For File browser you need two thing

1. Directory path (Directory which user selects)
2. List of all file.

for 1. Requirement you can use FileBrowser,
and for 2.
you have to add list box and load all file list in the below code will help

//Here "c:\user\public\picture" is Directory path It can be any path form harddrive
string[] filePaths = Directory.GetFiles(@"c:\user\public\picture");
foreach (string m in filePaths)
{
    ListViewItem liv = new ListViewItem(m);
    listView1.Items.Add(liv);
}

All the Best