Classe OpenFileDialog

privatevoid button1_Click(object sender, System.EventArgs e)
{
    Stream myStream = null;
    OpenFileDialog openFileDialog1 = new OpenFileDialog();

    openFileDialog1.InitialDirectory = "c:\\" ;
    openFileDialog1.Filter = "txt files (*.txt)|*.txt|All files (*.*)|*.*" ;
    openFileDialog1.FilterIndex = 2 ;
    openFileDialog1.RestoreDirectory = true ;

    if(openFileDialog1.ShowDialog() == DialogResult.OK)
    {
        try
        {
            if ((myStream = openFileDialog1.OpenFile()) != null)
            {
                using (myStream)
                {
                    // Insert code to read the stream here.
                }
            }
        }
        catch (Exception ex)
        {
            MessageBox.Show("Error: Could not read file from disk. Original error: " + ex.Message);
        }
    }
}

protected void button1_Click(Object sender, System.EventArgs e)
{
    Stream myStream;
    OpenFileDialog openFileDialog1 = new OpenFileDialog();
    openFileDialog1.set_InitialDirectory("c:\\");
    openFileDialog1.set_Filter(
        "txt files (*.txt)|*.txt|All files (*.*)|*.*");
    openFileDialog1.set_FilterIndex(2);
    openFileDialog1.set_RestoreDirectory(true);
    if (openFileDialog1.ShowDialog().Equals(get_DialogResult().OK)) {
        if ((myStream = openFileDialog1.OpenFile()) != null) {
            // Insert code to read the stream here.
            myStream.Close();
        }
    }
} //button1_Click