Invoke or BeginInvoke cannot be called on a control

Question

Invoke or BeginInvoke cannot be called on a control until the window handle has been created.

Laxmidhar Sahoo · Answer

hello look the bellow code may help you 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.Threading; namespace webresponse { public partial class Form3 : Form { public delegate void UpdateLabel( string label); public bool IsCancelled { get ; set ; } public Form3() { InitializeComponent(); } private void UpdateUI( string labelText) { lblStopWatch.Text = labelText; } private void btnStart_Click( object sender, EventArgs e) { DateTime startTime = DateTime.Now; IsCancelled = false ; Thread t = new Thread(() => { while (IsCancelled== false ) { Thread.Sleep(1000); string timeElapsedInstring = (DateTime.Now - startTime).ToString(@ "hh\:mm\:ss" ); lblStopWatch.Invoke( new UpdateLabel(UpdateUI), timeElapsedInstring); } }); t.Start(); } private void btnStop_Click( object sender, EventArgs e) { IsCancelled = true ; } } } In the threading call the deligate function

Invoke or BeginInvoke cannot be called on a control

Answers (1)