Need help with my server-client application

while ((count = stream.Read(bytes, 0, bytes.Length)) != 0)
            {
                data = System.Text.Encoding.ASCII.GetString(bytes, 0, count);
                string[] parts = data.Split(',');

                if (parts.Length >= 3)
                {
                    string examCode = parts[0];
                    string username = parts[1];
                    int password = int.Parse(parts[2]); 

                    resultExamCode = SearchForExamCode(examCode);
                    resultUsername = SearchForUsername(username);

                    if (resultExamCode.Equals("Not found") || 
                        resultExamCode.Equals("Not found") || 
                        password != 12345678)
                    {
                        result = "There is an incorrect field from your inputted information, re-enter again!";
                        
                    } else
                    {
                        result = "Success"; 
                    }
                }

                Byte[] msg = System.Text.Encoding.ASCII.GetBytes(result);
                stream.Write(msg, 0, msg.Length);
            }

while ((count = stream.Read(bytes, 0, bytes.Length)) != 0)
            {
                data = System.Text.Encoding.ASCII.GetString(bytes, 0, count);
                string[] parts = data.Split(',');

                if (parts.Length >= 3)
                {
                    string examCode = parts[0];
                    string username = parts[1];
                    int password = int.Parse(parts[2]); 

                    resultExamCode = SearchForExamCode(examCode);
                    resultUsername = SearchForUsername(username);

                    if (resultExamCode.Equals("Not found") || 
                        resultExamCode.Equals("Not found") || 
                        password != 12345678)
                    {
                        result = "There is an incorrect field from your inputted information, re-enter again!";
                        
                    } else
                    {
                        result = "Success"; 
                    }
                }

                Byte[] msg = System.Text.Encoding.ASCII.GetBytes(result);
                stream.Write(msg, 0, msg.Length);
            }