I need to print the name of files inside a folder using C#?

System.IO.DirectoryInfo dir = new System.IO.DirectoryInfo("c:\\");
System.IO.FileInfo[] diar1 = dir.GetFiles();//get all list of files inside the directory
System.IO.FileInfo dra = null;

//list the names of all files in the specified directory
foreach (System.IO.FileInfo dra_loopVariable in diar1) {
dra = dra_loopVariable;
ListBox1.Items.Add(dra);
}