How to send integer via bluetooth to Arduino in WP8?

I am making an application where I need to send my phone's accelerometer readings to my Arduino via bluetooth. I am able to send strings easily but, I am getting errors when I am altering the function for integers. Here is the code I used:

 private async void BT2Arduino_Sendint(int value)
    {



        if (BTSock == null) // If we don't have a connection, Send Error Control
        {
            // MessageBox.Show("Please connect to a device first."); // Alert the user with a Notification (Optional)
            txtBTStatus.Text = "No connection found. Try again!"; // Alert the UI
            return; // Stop
        }
        else
            if (BTSock != null) // Since we have a Connection
            {
               byte[] buffer = new byte[] { Convert.ToByte(value) };
               var datab = GetBufferFromByteArray(UTF8Encoding.UTF8.GetBytes(buffer, 0, 4)); // Create Buffer/Packet for Sending
              await BTSock.OutputStream.WriteAsync(datab); // Send our Message to Connected Arduino

                txtBTStatus.Text = "Connected to the Device";
            }
    }


    private IBuffer GetBufferFromByteArray(byte[] package)
    {
        using (DataWriter dw = new DataWriter())
        {
            dw.WriteBytes(package);
            return dw.DetachBuffer();
        }
    }

The error is basically in the line where I am using UTF8 encoding. It says "The best overloaded method match for System.Text.Encoding.GetBytes(char[], int, int) has some invalid arguments" Please help me resolve this issue as soon as you can. I know I am doing a mistake with the basics, but I don't have much knowledge with Encoding. Thanks for any help you can provide. :)