How to display image which is received by comport in asp.net

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ASP.NET

I am using serial port to receive image from other computer in asp.net. I am using other software to send image to my serial port it will sent perfectly and i am also receive it to my port buffer but i get it in byte so i can't see it in my image control i am using this code to receive and display image:

byte[] comBuffer;
           int bytes;
           if (comport.IsOpen)
           {
               bytes = comport.BytesToRead;
               comBuffer = new byte[bytes];
               comport.Read(comBuffer, 0, bytes);
               int test_bytes = comport.BytesToRead;
               ComBuffer_Test = new byte[test_bytes];
               comport.Read(ComBuffer_Test, 0, test_bytes);
               for (int i = 0; i < test_bytes; i++)
               {
                   sb_testdata.Append(ComBuffer_Test[i]);
                   sb_testdata.AppendFormat(" ", ComBuffer_Test[i]);
               }
 temp_test = sb_testdata.ToString();

Image1.ImageUrl = temp_test.ToString();

Image1 is my image control id.
How can i see image to my control.