How to send GCM notification in javascript.

Private Sub Frm_SendNotification()

RegId = "xxxxx"

ApplicationID = "xxxxx"

SENDER_ID = "xxxx"

Dim value = TextBox1.Text

'message text box

Dim tRequest As WebRequest

tRequest = WebRequest.Create("https://android.googleapis.com/gcm/send")

tRequest.Method = "post"

tRequest.ContentType = "application/x-www-form-urlencoded;charset=UTF-8"

tRequest.Headers.Add(String.Format("Authorization: key={0}", ApplicationID))

tRequest.Headers.Add(String.Format("Sender: id={0}", SENDER_ID))

'Data post to the Server

'Dim postData As String = (Convert.ToString("collapse_key=score_update&time_to_live=108&delay_while_idle=1&data.message=" + value + "&data.time=" + System.DateTime.Now.ToString() + "&registration_id=") & RegId) + ""

Dim postData As String = (Convert.ToString("data.message=" + value + "&registration_id=") & RegId) + ""

Console.WriteLine(postData)

Dim byteArray As [Byte]() = Encoding.UTF8.GetBytes(postData)

tRequest.ContentLength = byteArray.Length

Dim dataStream As Stream = tRequest.GetRequestStream()

dataStream.Write(byteArray, 0, byteArray.Length)

dataStream.Close()

Dim tResponse As WebResponse = tRequest.GetResponse()

dataStream = tResponse.GetResponseStream()

Dim tReader As New StreamReader(dataStream)

Dim sResponseFromServer As [String] = tReader.ReadToEnd()

'Get response from GCM server

Label1.Text = sResponseFromServer

'Assigning GCM response to Label text

tReader.Close()

dataStream.Close()

tResponse.Close()

End Sub