C# Online Compiler | .NET Fiddle

<no name> by Anonymous

//MH_Register
@using WebApplication1
@{
    Layout = null;
    User newuser = new User();
    if (IsPost)
    {
        newuser.usename = Request["usename"];
        newuser.password = Request["usename"];
        newuser.fullname = Request["fullname"];
        newuser.address = Request["address"];
        XL_USER.Register(newuser);
    }
}

<!DOCTYPE html>

<html>
<head>
    <meta name="viewport" content="width=device-width" />
    <title></title>
</head>
<body>
    <div>
        <form action="~/GiaoDien/MH_Register_User.cshtml" method="post">
            Usename: <input type="text" name="usename" value="" />
            Password: <input type="text" name="password" value="" />
            Fullname: <input type="text" name="fullname" value="" />
            Address: <input type="text" name="address" value="" />
            <input type="submit" name="Register" />
        </form>
    
    </div>
</body>
</html>

//XL_USER
namespace WebApplication1
{
    public class XL_USER
    {
        public static void Register(User newuser)
        {
            var datauser = LT_USER.ReadDataUser();
            newuser.Id = datauser.Count + 1;
            datauser.Add(newuser);
            LT_USER.SaveDataUser(datauser);
        }

    }
}


//LT_USER
namespace WebApplication1
{
    public class LT_USER
    {
        private const string FILEPATH = "G:\\IT\\Ky thuat lap trinh\\Luyen tap\\Bai_giang\\user.txt";
        public static List<User> ReadDataUser()
        {
            StreamReader reader = new StreamReader(FILEPATH);
            var DataCount = int.Parse(reader.ReadLine());
            List<User> ListUser = new List<User>();
            for (int i = 0; i <DataCount; i++)
            {
                string a = reader.ReadLine();
                string[] ThongTin = a.Split(',');
                User eachuser;
                eachuser.Id = int.Parse(ThongTin[0]);
                eachuser.usename = ThongTin[1];
                eachuser.password = ThongTin[2];
                eachuser.fullname = ThongTin[3];
                eachuser.address = ThongTin[4];
                ListUser.Add(eachuser);
            }
            reader.Close();
            return ListUser;
        }
        public static void SaveDataUser (List<User> listdata)
        {           
                StreamWriter writer = new StreamWriter(FILEPATH);
                writer.WriteLine(listdata.Count);
                foreach (var eachuser in listdata)
                {
                    writer.WriteLine($"{eachuser.Id},{eachuser.usename},{eachuser.password},{eachuser.fullname},{eachuser.address}");
                }
                writer.Close();            
        }


    }
}

​x
 
//MH_Register
@using WebApplication1
@{
    Layout = null;
    User newuser = new User();
    if (IsPost)
    {
        newuser.usename = Request["usename"];
        newuser.password = Request["usename"];
        newuser.fullname = Request["fullname"];
        newuser.address = Request["address"];
        XL_USER.Register(newuser);
    }
}
​
<!DOCTYPE html>
​
<html>
<head>
    <meta name="viewport" content="width=device-width" />
    <title></title>
</head>
<body>
    <div>
        <form action="~/GiaoDien/MH_Register_User.cshtml" method="post">
            Usename: <input type="text" name="usename" value="" />
            Password: <input type="text" name="password" value="" />
            Fullname: <input type="text" name="fullname" value="" />
            Address: <input type="text" name="address" value="" />
            <input type="submit" name="Register" />
        </form>
    
    </div>
</body>
</html>
​
//XL_USER
namespace WebApplication1
{
    public class XL_USER
    {
        public static void Register(User newuser)
        {
            var datauser = LT_USER.ReadDataUser();
            newuser.Id = datauser.Count + 1;
            datauser.Add(newuser);
            LT_USER.SaveDataUser(datauser);
        }
​
    }
}
​
​
//LT_USER
namespace WebApplication1
{
    public class LT_USER
    {
        private const string FILEPATH = "G:\\IT\\Ky thuat lap trinh\\Luyen tap\\Bai_giang\\user.txt";
        public static List<User> ReadDataUser()
        {
            StreamReader reader = new StreamReader(FILEPATH);
            var DataCount = int.Parse(reader.ReadLine());
            List<User> ListUser = new List<User>();
            for (int i = 0; i <DataCount; i++)
            {
                string a = reader.ReadLine();
                string[] ThongTin = a.Split(',');
                User eachuser;
                eachuser.Id = int.Parse(ThongTin[0]);
                eachuser.usename = ThongTin[1];
                eachuser.password = ThongTin[2];
                eachuser.fullname = ThongTin[3];
                eachuser.address = ThongTin[4];
                ListUser.Add(eachuser);
            }
            reader.Close();
            return ListUser;
        }
        public static void SaveDataUser (List<User> listdata)
        {           
                StreamWriter writer = new StreamWriter(FILEPATH);
                writer.WriteLine(listdata.Count);
                foreach (var eachuser in listdata)
                {
                    writer.WriteLine($"{eachuser.Id},{eachuser.usename},{eachuser.password},{eachuser.fullname},{eachuser.address}");
                }
                writer.Close();            
        }
​
​
    }
}

Compilation error (line 3, col 1): Keyword, identifier, or string expected after verbatim specifier: @
Compilation error (line 86, col 38): Unexpected character '$'
Compilation error (line 2, col 1): A namespace cannot directly contain members such as fields or methods
Compilation error (line 5, col 24): Expected class, delegate, enum, interface, or struct
Compilation error (line 8, col 35): Identifier expected
Compilation error (line 9, col 36): Identifier expected
Compilation error (line 10, col 36): Identifier expected
Compilation error (line 11, col 35): Identifier expected
Compilation error (line 13, col 5): Type or namespace definition, or end-of-file expected

Last Run:	5:29:28 am
Compile:	0s
Execute:	0.016s
Memory:	0b
CPU:	0s

View IL Code