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Base64 Encode or Decode a File

/ Published in: C#
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Useful for sending files past filters via email.

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  1. private void btnEncode_Click(object sender, EventArgs e)
  2. {
  3.   if (!string.IsNullOrEmpty(txtInFile.Text))
  4.   {
  5.     FileStream fs = new FileStream(txtInFile.Text, 
  6.                                    FileMode.Open, 
  7.                                    FileAccess.Read);
  8.     byte[] filebytes = new byte[fs.Length];
  9.     fs.Read(filebytes, 0, Convert.ToInt32(fs.Length));
  10.     string encodedData = 
  11.         Convert.ToBase64String(filebytes,                 
  12.                                Base64FormattingOptions.InsertLineBreaks);
  13.     txtEncoded.Text = encodedData; 
  14.   }
  15. }
  16.  
  17. private void btnDecode_Click(object sender, EventArgs e)
  18. {
  19.   if (!string.IsNullOrEmpty(txtOutFile.Text))
  20.   {
  21.     byte[] filebytes = Convert.FromBase64String(txtEncoded.Text);
  22.     FileStream fs = new FileStream(txtOutFile.Text, 
  23.                                    FileMode.CreateNew, 
  24.                                    FileAccess.Write, 
  25.                                    FileShare.None);
  26.     fs.Write(filebytes, 0, filebytes.Length);
  27.     fs.Close(); 
  28.   }
  29. }

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