BetfairClient.Login fails with INVALID_USERNAME_OR_PASSWORD

[Stereocheck]

Great work on the Library!

When I try do a non-interactive Login with BetfairClient.Login if fails with INVALID_USERNAME_OR_PASSWORD even though they are correct. Looking into this it seems the code for generating the post data does not correctly format the details as a URL formatted string. My password has several nonstandard characters in it which seem to be misinterpreted during login.

I replaced the following code:
string postData = string.Format("username={0}&password={1}", username, password);

with:

NameValueCollection outgoingQueryString = HttpUtility.ParseQueryString(String.Empty);
outgoingQueryString.Add("username", username);
outgoingQueryString.Add("password", password);
string postData = outgoingQueryString.ToString();

Which rectifies the problem and logs in successfully. There may be more succinct ways of achieving this but this worked for me.

Cheers.