（转）C# 文件另存为对话框

Stream myStream;
SaveFileDialog saveFileDialog1 = new SaveFileDialog();

saveFileDialog1.Filter = "txt files (*.txt)|*.txt";
saveFileDialog1.FilterIndex = 2;
saveFileDialog1.RestoreDirectory = true;

if (saveFileDialog1.ShowDialog() == DialogResult.OK)
{
if ((myStream = saveFileDialog1.OpenFile()) != null)
{
using (StreamWriter sw = new StreamWriter(myStream))
{
sw.Write("this is the text");
}

myStream.Close();
MessageBox.Show("Saved");
}
}