c#编写http请求

public static 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做出的响应
     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;
}