want to read msmq message fast using safe thread in c# .net

Question

I want to read the MSMQ where queue data in byte and numbers of queues generated in 1 mins about 1500.

If read continuously queue, cpu goes on 30%, and after some time it stopped.
I need to read queue in high volume upto 4 hrs.

I want safe thread reading in such a manner that shouldn't be blocked.
Actually I am not good about threading so can you please help me out?

Currently I am reading in this manner:

bool ProcessStatus; //process
Thread _UDPthreadConsme;

private void btn_receive_Click(object sender, EventArgs e)
       {

       if (MessageQueue.Exists(@".\private$\myquelocal"))
            {

                ThreadStart _processrcs = new ThreadStart(receivemessages);
                _UDPthreadConsme = new Thread(_processrcs);
                ProcessStatus = true;
                _UDPthreadConsme.Start();
             } 
       }


private void receivemessages()
       {
           MessageBox.Show("Start");
           while (ProcessStatus)
           {
                   try
                        {

                            // Connect to the a queue on the local computer.
                            MessageQueue myQueue = new MessageQueue(@".\private$\myquelocal");


                            System.Messaging.Message[] myMessagecount = myQueue.GetAllMessages();

                            if (myMessagecount.Length <= 0)
                                return;

                       
                            myQueue.Formatter = new BinaryMessageFormatter();
                         
                            // Receive and format the message. 
                            System.Messaging.Message myMessage = myQueue.Receive();
                            byte[] buffer = (byte[])myMessage.Body;
                                    

// here i convert buffer to its related structure and then insert the values in database sqlserver.

           }
       }