MSMQ ReceiveCompleted event in javascript vs 2013

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ASP.NET4

Received message from MSMQ in asp.net using "ReceiveCompleted" in java script currently I am using following code. in code behind but it gives the issue to assign value in textbox.

e.g.
void MsgQ_ReceiveCompleted(object sender, ReceiveCompletedEventArgs e)
{

{

System.Messaging.Message msMessage = null;
msMessage = MsgQ.EndReceive(e.AsyncResult);
msMessage.Formatter = new XmlMessageFormatter(new String[] { "System.String,mscorlib" });
Textbox1.Text = msMessage.Body.ToString();
MsgQ.BeginReceive();
}