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VB.NET code sample (Unicode)

Imports System.Web
Imports System.IO
Imports System.Net
Imports System.Text


Public Class Application
	Public Shared Sub Main()


		Dim request As HttpWebRequest
		Dim response As HttpWebResponse = Nothing
		Dim reader As StreamReader
		Dim address As Uri

		Dim username As String
		Dim password As String
		Dim message As String
		Dim msisdn As String

		Dim data As New StringBuilder
		Dim byteData() As Byte
		Dim postStream As Stream = Nothing

		' If your firewall blocks access to port 5567, you can fall back to port 80:
		' address = New Uri("http://bulksms.2way.co.za/eapi/submission/send_sms/2/2.0?")
		' (See FAQ for more details.)
		address = New Uri("http://bulksms.2way.co.za:5567/eapi/submission/send_sms/2/2.0?")

		' Create the web request
		request = DirectCast(WebRequest.Create(address), HttpWebRequest)

		' Set type to POST
		request.Method = "POST"
		request.ContentType = "application/x-www-form-urlencoded"

		' Create the data we want to send
		data.Append("username=" + HttpUtility.UrlEncode("myusername", System.Text.Encoding.GetEncoding("ISO-8859-1")))
		data.Append("&password=" + HttpUtility.UrlEncode("mypassword", System.Text.Encoding.GetEncoding("ISO-8859-1")))
		data.Append("&message=" + stringToHex("This is a test: ¥ € ₣"))
		data.Append("&msisdn=27798919426")
		data.Append("&want_report=1")
		data.Append("&dca=16bit")

		' Create a byte array of the data we want to send
		byteData = System.Text.Encoding.GetEncoding("ISO-8859-1").GetBytes(data.ToString())

		' Set the content length in the request headers
		request.ContentLength = byteData.Length

		' Write data
		Try
			postStream = request.GetRequestStream()
			postStream.Write(byteData, 0, byteData.Length)
		Catch ex As Exception
			Console.WriteLine(ex.toString())
		Finally
			If Not postStream Is Nothing Then postStream.Close()
		End Try

		Try
			' Get response
			response = DirectCast(request.GetResponse(), HttpWebResponse)

			' Get the response stream into a reader
			reader = New StreamReader(response.GetResponseStream())

			' Console application output
			Console.WriteLine(reader.ReadToEnd())
		Catch ex As Exception
			Console.WriteLine(ex.toString())
		Finally
			If Not response Is Nothing Then response.Close()
		End Try
	End Sub

	Public Shared Function stringToHex(s As String) as String

		Dim ascii_number As String
		Dim hex_str As String
		Dim sResult As String
		Dim nCnt As Integer

		For nCnt = 1 To Len(s)
    			ascii_number = AscW(Mid(s, nCnt, 1))
    			hex_str = Hex(ascii_number)
			IF Len(hex_str) = 4 Then
				sResult = sResult & (Hex(ascii_number))
			Else
        			sResult = sResult & ("00" & hex_str)
        		End IF
		Next
		stringToHex = sResult
	End Function

End Class