C#

string base64;
<p>
using (FileStream fs = new FileStream(@"c:\whatever.doc", FileMode.Open, FileAccess.Read))
{
	byte[] data = new byte[fs.Length];
	fs.Read(data, 0, data.Length);
	base64 = Convert.ToBase64String(data);
}
</p>

byte[] data2 = Convert.FromBase64String(base64);
<p>
using (FileStream fs = new FileStream(@"c:\whatever2.doc", FileMode.Create, FileAccess.Write))
{
	fs.Write(data2, 0, data2.Length);
}</p>

public void DecodeFileTo64Digits(string txtinput)<br />
    {<br />
        byte[] data2 = Convert.FromBase64String(txtinput);<br />
        using (FileStream fs = new FileStream(@"C:\Documents and Settings\Administrateur\Bureau\Doc.doc", FileMode.Create, FileAccess.Write))<br />
        {<br />
         fs.Write(data2, 0, data2.Length);<br />
        }<br />
        <br />
    }

interface ICredentials {
 // put the declaration of all methods/properties here
}

class Credentials:ICredentials {
  // implement the interface here
}

DAL.Server = MyCreds.Server