Using InternetExplorer.Navigate to send POST

Hi, I've found how to use this method in Visual Basic, but not able to make 
the same in C#. Someone can help me?

I'm trying thus:
code:

string header = "Content-Type: application/x-www-form-urlencoded\t\" + a + b
;
string postData = "username='min'&password='min'";
                    byte[] postDataArray = ASCIIEncoding.ASCII.GetBytes(post
Data);
object missing = Type.Missing;
                    ie.Navigate2(this.URL, ref missing,ref missing,ref postD
ataArray ,header);


Someone said that i have to append 
code:
vbCrLf (= Chr(13) & Chr(10));
  Whats the 
meaning...

You can see i have no idea whats going wrong, im sure i havent understood th
e way to use it, can someone help me?

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