WinForm的WebRequest问题

[Error_Code]

WebClient Client = new WebClient();
String Url = "http://***/check.asp?user="+user;   //user是textbox1.text.trim()
Byte[] data=new byte[1024];
try
{
     WebRequest myreq = WebRequest.Create(Url );
     data = Client.DownloadData(Url);
}
catch (WebException expc)
{
     MessageBox.Show(expc.Message, "网络错误");
}
return Encoding.Default.GetString(data);

check.asp用GET方法得到user 执行一个查询 如果存在这个user 返回true 否则返回false
----------问题来了
我用IE访问http://***/check.asp?user=张3,结果是true
同样的URL 这里return Encoding.Default.GetString(data)得到的却是false 何解??

会不会是因为执行的时候吧后面的 ?user=张3 给丢了??
要怎样才能拿到正确结果

[aiht]

WebClient.QueryString Property
你可以看看，我是新手，但是感觉这个对你有用

下面是msdn上的例子：

			string uriString = "http://www.contoso.com/search";
			// Create a new WebClient instance.
			WebClient myWebClient = new WebClient();
			// Create a new NameValueCollection instance to hold the QueryString parameters and values.
			NameValueCollection myQueryStringCollection = new NameValueCollection();
			Console.Write("Enter the word(s), separated by space character to search for in " +  uriString + ": ");
			// Read user input phrase to search for at uriString.
			string searchPhrase = Console.ReadLine();
			if (searchPhrase.Length > 1)
				// Assign the user-defined search phrase.
				myQueryStringCollection.Add("q",searchPhrase);
			else
				// If error, default to search for 'Microsoft'.
				myQueryStringCollection.Add("q","Microsoft");		
			// Assign auxilliary parameters required for the search.
			Console.WriteLine("Searching " + uriString + " .......");
			// Attach QueryString to the WebClient.
			myWebClient.QueryString = myQueryStringCollection;
			// Download the search results Web page into 'searchresult.htm' for inspection.
			myWebClient.DownloadFile (uriString, "searchresult.htm");
			Console.WriteLine("\nDownload of " + uriString + " was successful. Please see 'searchresult.htm' for results.");

[aiht]

做了个测试，果然可以，
要用System.Collections.Specialized;

            String Url = "http://localhost/NetSite/Default.aspx";   

            WebClient Client = new WebClient();
            NameValueCollection nvc = new NameValueCollection();
            nvc.Add("str", "nihaohaohodjsajdlaj");
            Client.QueryString = nvc;
            Byte[] data = new byte[1024];
            try
            {
                WebRequest myreq = WebRequest.Create(Url);

                data = Client.DownloadData(Url);
            }
            catch (WebException expc)
            {
                MessageBox.Show(expc.Message, "网络错误");
            }
            textBox1.Text= Encoding.Default.GetString(data);

[Error_Code]

找到了 问题不在这里
刚刚吧那个页面加了点东西 让他返回错误的同时 返回传过来的参数具体是什么
结果在程序里得到的是一堆乱码

String Url = "http://***/check.asp?user=张3"
程序里访问这个地址
页面返回的是 "Error"+乱码 那么页面在执行查询的时候肯定查的是这个乱码了 晕

结贴 不知道是怎么转的 好像中文就会出这个问题
只有改数据库了 user=Md5(张3)再错就无语了