[WinForm] OpenFileDialog

OpenFileDialog open_file_dialog = new OpenFileDialog();
open_file_dialog.Filter = "dat Files|*.dat|All Files|*.*";
open_file_dialog.FilterIndex = 1;
open_file_dialog.RestoreDirectory = true;

try
{
    if (open_file_dialog.ShowDialog() == DialogResult.OK)
    {
        import_path = open_file_dialog.FileName;
    }
}
catch (System.Exception)
{
}