C# GET、POST方式請求web

private string GetModel(string strUrl)
   {
    string strRet = null;
    try
    {
     HttpWebRequest request = (HttpWebRequest)WebRequest.Create(strUrl);
     request.Timeout = 2000;
     HttpWebResponse response = (HttpWebResponse)request.GetResponse();
   
     System.IO.Stream resStream = response.GetResponseStream();  
     Encoding encode = System.Text.Encoding.Default;
     StreamReader readStream = new StreamReader( resStream, encode );

     Char[] read = new Char[256];
     int count = readStream.Read( read, 0, 256 );
     while (count > 0)
     {
      String str = new String(read, 0, count);
      strRet = strRet + str;
      count = readStream.Read(read, 0, 256);
     }

     resStream.Close();
    }
    catch(Exception e)
    {
     strRet="";
    }
    return strRet;
   }

public static string PostModel(string strUrl, string strParm)
   {
    Encoding encode = System.Text.Encoding.Default;

    byte[] arrB = encode.GetBytes(strParm);
    string strBaseUrl = null;
  
    HttpWebRequest myReq = (HttpWebRequest)WebRequest.Create(strUrl);
    myReq.Method = "POST" ;
    myReq.ContentType = "application/x-www-form-urlencoded";
    myReq.ContentLength = arrB.Length;
    Stream outStream = myReq.GetRequestStream();           
    outStream.Write(arrB,0,arrB.Length);
    outStream.Close();
               WebResponse myResp = null;
    try
    {
     //接收HTTP做出的響應
     myResp = myReq.GetResponse();
    }
    catch(Exception e)
    {
      int ii =0;
    }
    Stream ReceiveStream = myResp.GetResponseStream();               
    StreamReader readStream = new StreamReader( ReceiveStream, encode );
    Char[] read = new Char[256];
    int count = readStream.Read( read, 0, 256 );
    string str = null;
    while (count > 0)
    {
     str += new String(read, 0, count);
     count = readStream.Read(read, 0, 256);
    }
    readStream.Close();
    myResp.Close();
               return str;
   }