HttpRequest.InputStream Property

System.IO.Stream str; String strmContents;
Int32 counter, strLen, strRead;
// Create a Stream object.
str = Request.InputStream;
// Find number of bytes in stream.
strLen = Convert.ToInt32(str.Length);
// Create a byte array.
byte[] strArr = new byte[strLen];
// Read stream into byte array.
strRead = str.Read(strArr, 0, strLen);

// Convert byte array to a text string.
strmContents = "";
for (counter = 0; counter < strLen; counter++)
{
    strmContents = strmContents + strArr[counter].ToString();            
}