得到一个网页的源代码

我想得到一个网页的源代码 传进去一个 url地址 其中这个url带有参数 当我输入的参数是字母或数字时候 可以正确的获得url地址网页的源代码 我用过的方法如下：
方法1
private string getWebresourceFile1(string url)
{

WebClient myWebClient = new WebClient();
byte[] myDataBuffer = myWebClient.DownloadData(url);
string SourceCode = Encoding.Default.GetString(myDataBuffer);
saveSourceCode(SourceCode);
return SourceCode;
}

方法2
private string getWebresourceFile2(string url)
{
HttpWebRequest request=(HttpWebRequest)WebRequest.Create(url);
HttpWebResponse response=(HttpWebResponse)request.GetResponse();
request.Method = "GET";
Stream receiveStream=response.GetResponseStream();
StreamReader readStream=new StreamReader(receiveStream,Encoding.Default);
string SourceCode=readStream.ReadToEnd();
saveSourceCode(SourceCode);
response.Close();
readStream.Close();
return SourceCode;

}
方法3
private string getWebresourceFile3(string url)
{
WebClient wc = new WebClient();
wc.Credentials = CredentialCache.DefaultCredentials;
Byte[] pageData = wc.DownloadData(url);
string SourceCode = Encoding.Default.GetString(pageData);
saveSourceCode(SourceCode);
wc.Dispose();
return SourceCode;
}

方法4
private string getWebresourceFile4(string url)
{
WebClient wc = new WebClient();
wc.Credentials = CredentialCache.DefaultCredentials;
Stream resStream = wc.OpenRead(url);
StreamReader sr = new StreamReader(resStream,System.Text.Encoding.Default);

string SourceCode = sr.ReadToEnd();
saveSourceCode(SourceCode);
resStream.Close();
wc.Dispose();
return SourceCode;
}
方法5
private string getWebresourceFile5(string url)
{
WebRequest request = WebRequest.Create(url);
WebResponse response = request.GetResponse();
Stream resStream = response.GetResponseStream();
StreamReader sr = new StreamReader(resStream, System.Text.Encoding.Default);
string SourceCode = sr.ReadToEnd();
saveSourceCode(SourceCode);
resStream.Close();
sr.Close();
return SourceCode;
}