Open file dialog

OpenFileDialog oDlg = new OpenFileDialog();
oDlg.Title = "Select TXT";
oDlg.Filter = "TXT (*.Txt)|*.txt";
oDlg.RestoreDirectory = true;
string dir = Environment.GetFolderPath(Environment.SpecialFolder.Desktop);
oDlg.InitialDirectory = dir;
DialogResult result = oDlg.ShowDialog();
if (result == DialogResult.OK)
{
lblSourcetxt.Text = oDlg.FileName;
}