CODEWITHSUNDEEP
c#.net
Ace Caserya
Ace Caserya

Reputation: 2925

"using namespace" problems on DNS and AddressFamily

'm a newbie in C# normally my forte is C++ and VB. I have 2 problem in which i have commented on the code:

1.) Blue squiggle lines appear on the 3 Uses it say ""A using namespace directive can only be applied to namespaces; 'System.Object' ... "

2.) i could not get an output IP address from my variable LocalIP in which i declared as public.

Thanks in advance.

using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.Linq;
using System.Text;
using System.Windows.Forms;
using System.Net;

//Blue squiggly line appear on this 2 Uses
using Dns = System.Net.Dns;
using AddressFamily = System.Net.Sockets.AddressFamily;


namespace WindowsFormsApplication1
{
public partial class frm_Log : Form
{
    public String localIP;

    public string LocalIPAddress()
    {
        IPHostEntry host;
        //string localIP = "";
        host = Dns.GetHostEntry(Dns.GetHostName());
        foreach (IPAddress ip in host.AddressList)
        {
            if (ip.AddressFamily == AddressFamily.InterNetwork)
            {
                localIP = ip.ToString();
                break;
            }
        }
        return localIP;
    }

    ....
    ....

    // variable localIP.Trim() does not giveout any output
    MyValue="LogAccept,"+this.txt_UserName.Text.Trim()+","+this.txt_Password.Text.Trim() + "," + localIP.Trim() ;

    ....
    ....

Upvotes: 0

Views: 1809

Answers (3)

Ace Caserya
Ace Caserya

Reputation: 2925

Original Code was

using System
....
using System.Object;
using System.Net.Dns;
using System.Net.Sockets.AddressFamily;
....

resolution

//using System.Object --> since uses system already defined.
using Dns = System.Net.Dns;
using AddressFamily = System.Net.Sockets.AddressFamily;

Upvotes: 0

Patashu
Patashu

Reputation: 21773

http://msdn.microsoft.com/en-US/library/sf0df423(v=vs.80).aspx suggests this syntax:

using Dns = System.Net.Dns;

The standard version of using (using System.Linq;) can only target namespaces, not classes in a namespace. If you have imported a whole namespace, though, you don't need to specifically import anything in it.

Upvotes: 1

Karl Anderson
Karl Anderson

Reputation: 34846

System.Object is a class. System is the namespace, which you already have defined as the first using at the top of the file.

Upvotes: 1

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