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Getting Request Stream of HttpWebRequest gives ProtocolViolationException

Posted By:      Posted Date: October 08, 2010    Points: 0   Category :WPF

I have the following code


var req = HttpWebRequest . Create ( "http://www.imageshack.us/upload_api.php" );
. ContentType = "multipart/form-data" ;
+= "key=xxx&" ;
+= "type=base64&" ;

// get base64 data from image
var fs = new FileStream (@ "D:\tmp\WpfApplication1\WpfApplication1\Images\Icon128.gif" , FileMode . Open , FileAccess . Read );
byte [] bytes =

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Hoping someone can point me to a solution, haven't been able to find one yet.

I'm using the standard way for send HttpWebRequest

		webRequest = (HttpWebRequest)WebRequest.Create(request.URL);
webRequest.Method = "POST";
webRequest.ContentType = "text/xml";


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Ive 'inherited' some code that creates a HttpWebRequest object to consume a webservice and am working through it to figure out what each bit does.  Ive never consumed webservices this way before (I always create a webreference) so this way of working is new to me.  I can follow all of it except for one bit.  Heres the code Im having trouble understanding

ASCIIEncoding encoding = new ASCIIEncoding();
byte[] bytesToWrite = encoding.GetBytes("The message here");

// create web request
const string Action = "http://Awebaddress.org/AProcess"; 
HttpWebRequest httpWebRequest = (HttpWebRequest)WebRequest.Create("The web service url here");

const string contentType = "text/xml; charset=utf-8";
httpWebRequest.Method = "POST";
httpWebRequest.ContentType = contentType;
httpWebRequest.Timeout = -1;
httpWebRequest.ContentLength = bytesToWrite.Length;

the line im having trouble with is this one

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