WinForm C # RichTextBox saved as txt text document

WinForm C # RichTextBox saved as txt text document

private void Btn_save_click (object sender, EventArgs e)
{
if (This.richTextBox1.Text = "")
Return
Savefiledialog1.defaultext = "txt";
Savefiledialog1.filter = "Text files (*.txt) |*.txt| All Files (*.*) |*.* ";
if (this.saveFileDialog1.ShowDialog () = = DialogResult.Cancel)
Return
string FileName = This.saveFileDialog1.FileName;

if (savefiledialog1.showdialog () = = DialogResult.OK &&filename.length > 0)
{
Save the contents of the RichTextBox into the file.
Richtextbox1.savefile (Savefiledialog1.filename, Richtextboxstreamtype.plaintext);
MessageBox.Show ("The file has been saved successfully");
}
}