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POC# Windows Form application Error : "Cross-thread operation not valid."
 

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    <p>I am trying to build a simple windows form application in C#. where <code>lblIPAddress</code> show my local IP address and <code>lblInfo</code>shows my last updated time of my IP address.<code>btnRefresh</code> is use to refresh the data. But as soon as <code>tickTimer_Elapsed</code> event fired it throws the error "Cross-thread operation not valid: Control 'lblInfo' accessed from a thread other than the thread it was created on."</p> <p>Please suggest. My complete code has shown below:</p> <pre><code>using System; using System.Collections.Generic; using System.ComponentModel; using System.Data; using System.Drawing; using System.Linq; using System.Text; using System.Threading.Tasks; using System.Windows.Forms; using System.Net; using System.Net.Sockets; using Time = System.Timers; using Connect = System.Net.NetworkInformation.NetworkInterface; namespace ShowMyIP { public class UpdatedInfo { public string lastUpdate = string.Empty; public string localIP = string.Empty; } public partial class ShowLocalIP : Form { UpdatedInfo updatedIP; public static Time.Timer tickTimer = new Time.Timer(); public const int INTERVAL = 60 * 1000; public ShowLocalIP() { InitializeComponent(); InitializeTimer(); updatedIP = new UpdatedInfo(); updatedIP = GetLocalIP(updatedIP); lblIPAddress.Text = updatedIP.localIP; lblInfo.Text = updatedIP.lastUpdate; } public void InitializeTimer() { tickTimer.Interval = INTERVAL; tickTimer.Enabled = true; tickTimer.Elapsed += new Time.ElapsedEventHandler(tickTimer_Elapsed); tickTimer.Start(); GC.KeepAlive(tickTimer); } private void tickTimer_Elapsed(object sender, Time.ElapsedEventArgs e) { updatedIP = new UpdatedInfo(); updatedIP = GetLocalIP(updatedIP); lblIPAddress.Text = updatedIP.localIP; lblInfo.Text = updatedIP.lastUpdate; tickTimer.Interval = INTERVAL; tickTimer.Enabled = true; tickTimer.Start(); GC.KeepAlive(tickTimer); } private UpdatedInfo GetLocalIP(UpdatedInfo UpdatedIP) { if (Connect.GetIsNetworkAvailable()) { IPHostEntry host; host = Dns.GetHostEntry(Dns.GetHostName()); foreach (IPAddress ip in host.AddressList) { if (ip.AddressFamily == AddressFamily.InterNetwork) { UpdatedIP.localIP = ip.ToString(); UpdatedIP.lastUpdate = DateTime.Now.ToShortTimeString(); break; } } } else { UpdatedIP.localIP = "127.0.0.1"; UpdatedIP.lastUpdate = DateTime.Now.ToShortTimeString(); } return UpdatedIP; } private void btnRefresh_Click(object sender, EventArgs e) { updatedIP = new UpdatedInfo(); updatedIP = GetLocalIP(updatedIP); lblIPAddress.Text = updatedIP.localIP; lblInfo.Text = updatedIP.lastUpdate; } } } </code></pre>
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    1. USAjay Verma
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    1. CO@PeterRitchie Thank you. But i am not using any thread concept here.
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      1. USAjay Verma
    2. COThe Timer runs on its own thread. So yes, you *are* using a thread... concept.
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      1. USRobert Harvey
    3. CO@Peter I am sorry. I missed that. I forgot actually. Yes, you are right.
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