Pass parameters to java webservice from c#.net

[Puniiii123]

Below are 2 ways i tried but m not able to pass parameters to the web service

<1>
Uri address = new Uri("http://203.88.135.58:8083/JLLSFAServer/SalesForceAutomation/loginVerification");  
 
        // Create the web request  
        HttpWebRequest request = WebRequest.Create(address) as HttpWebRequest;  
 
        // Set type to POST  
        request.Method = "POST";
        request.ContentType = "application/x-www-form-urlencoded";  
 
        // Create the data we want to send  
        string appId = "loginName";
        string context = "password";  
 
 
        StringBuilder data = new StringBuilder();
        data.Append("loginName=" + HttpUtility.UrlEncode("E000002028"));
        data.Append("&password=" + HttpUtility.UrlEncode("49505152"));  
        //data.Append("&query=" + HttpUtility.UrlEncode(query));  
 
        // Create a byte array of the data we want to send  
        byte[] byteData = UTF8Encoding.UTF8.GetBytes(data.ToString());  
 
        // Set the content length in the request headers  
        request.ContentLength = byteData.Length;  
 
        // Write data  
        Stream postStream = request.GetRequestStream();
            postStream.Write(byteData, 0, byteData.Length);
 
 
        // Get response  
        using (HttpWebResponse response = request.GetResponse() as HttpWebResponse)  
        {  
         // Get the response stream  
         StreamReader reader = new StreamReader(response.GetResponseStream());  
 
         // Console application output  
          string results=reader.ReadToEnd();  
        }  
 
 
 
<2>
WebClient request = new WebClient();
            string data = "E000002028";
            string password = "49505152";
            string postData = "{\"loginName\":\"" + data + "\"" + "&\"password\":\"" + password + "\"}";
            byte[] bytearray = Encoding.UTF8.GetBytes(postData);
 
            request.Headers.Add("Content-Type", "application/json");
 
            string results= request.UploadString("http://203.88.135.58:8083/JLLSFAServer/SalesForceAutomation/loginVerification", "POST", postData);
 
 
 

Its returning 4 which webservice returns when login name is invalid.
Can anyone help me in this??
Is the parameter passing way correct??