[Closed] Dotnet > Encoding UTF8

I’m making a script that sends information via “POST” using dotNet to a web server. I can be sent to the “String” must convert to UTF8 and so use the properties of ByteArray. But this conversion returns error. For example, I can not use the length parameter after converting it.

this is code:

clearlistener()
fn sendPost =
(
	--variables
	url = "http://www.explample.com"
	sendText = "Send this text"
	
	-- http webrequest
	httpRequest = (dotNetClass "system.Net.WebRequest").create (url as string)
	[...]

	-- encoding text > UTF8
	Encoding = DotnetClass "System.Text.Encoding.UTF8"
	byteData = Encoding.GetBytes(sendText)
	
	-- send
	httpRequest.ContentLength = byteData.Length -- No found length in byteData ?
	dataStream = httpRequest.GetRequestStream()
	dataStream.Write(byteData, 0, byteData.Length) -- No write but no found length
	dataStream.Close()
	response = httpRequest.GetResponse()
)
sendPost()