How to add Save file Dialog Box using C#

I need to implement something similar to Notepads' save option. Assuming I have a button placed next to a Ric开发者_运维知识库hTextBox, what I want is, when this button is clicked, a Dialogue box will open up, which will look similar to the one that appears when Save As is clicked. I would like to save the content of the RichTextBox in text format, by entering the name of file in the Save Dialogue box.

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private void Save_As_Click(object sender, EventArgs e)
{
  SaveFileDialog _SD = new SaveFileDialog(); 
  _SD.Filter = "Text File (*.txt)|*.txt|Show All Files (*.*)|*.*";
  _SD.FileName = "Untitled"; 
  _SD.Title = "Save As";
  if (__SD.ShowDialog() == DialogResult.OK)
  {
   RTBox1.SaveFile(__SD.FileName, RichTextBoxStreamType.UnicodePlainText);
  }
}

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For WPF you should use this SaveFileDialog.

var dialog = new Microsoft.Win32.SaveFileDialog();
dialog.Filter = "Rich Text File (*.rtf)|*.rtf|All Files (*.*)|*.*";
dialog.FileName = "Filename.rtf"; //set initial filename
if (dialog.ShowDialog() == true)
{
    using (var stream = dialog.OpenFile())
    {
       var range = new TextRange(myRichTextBox.Document.ContentStart,
                                 myRichTextBox.Document.ContentEnd);
       range.Save(stream, DataFormats.Rtf);
    }
}

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This works for text files and was tested in WPF.

var dialog = new Microsoft.Win32.SaveFileDialog();
dialog.Filter = "Text documents (.txt)|*.txt|All Files (*.*)|*.*"; 
dialog.FileName = "Filename.txt"; 
if (dialog.ShowDialog() == true)
{                
    File.WriteAllText(dialog.FileName, MyTextBox.Text);
}

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SaveFileDialog sfDialog = new SaveFileDialog();
sfDialog.ShowDialog();
OutputStream ostream = new FileOutputStream(new File(sfDialog.FileName));
WorkBook.write(ostream);
ostream.close();

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misread the question - Ray's answer is valid for OP

This works only in Windows Forms.

You should take a look at the SaveFileDialog class: http://msdn.microsoft.com/en-us/library/system.windows.forms.savefiledialog.aspx

And save the file using something like this (see here):

rtf.SaveFile(dialog.FileName);

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There is a SaveFileDialog component which you can use, read here to find out how it works and a working sample.