Accessing files

string foldername = this.folderBrowserDialog1.SelectedPath;

DirectoryInfo ourDir = new DirectoryInfo(foldername);

foreach(FileInfo file in ourDir.GetFiles())
{
DataRow dr = dtFileNames.NewRow();
dr[0] = file.FullName.ToString();//To get the file name with path
dr[1] = file.Name.ToString();// To get only the file name
dtFileNames.Rows.Add(dr);
this.listBox1.Items.Add(file.Name.ToString());
}