post method to modem

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ASP.NET

Hi Experts

how to send data to modem using the post method. I searched Google but was not getting an idea. I write my application like:

string ipadd = Request.UserHostAddress;
if (Request.Form["AUTH"] != null)
{
  //Clear existing stuff from response
  Response.Clear();
  Response.ClearContent();
  Response.ClearHeaders();
  //Set response type
  Response.ContentType = "text/plain";
  byte [] bt=ReadFully(Stream stream, int initialLength)
  Response.Write(" testing the data");
  //Response.End();
}

it is not working with modems. When I send the data in the post command, an error will display like "response failed".