Cross-thread operation not valid

[aplee]

Hello everyone, I have here a standalone application written using C# language.
Error occured when I hit the button "compute"

Please see below error:

Error Description : System.InvalidOperationExcepton: Cross-thread operation not valid: Control 'label1' accessed froma thread other than the thread it was created on.
at system.windows.forms.control.get_Handle()
at System.Windows.Forms.Control.set_WindowText(String value)
at System.Windows.Forms.Control.set_text(String Value)
at BCCSReportGenerator.frmComputeBCCS.GenerateReport() in D:\PROCUREMENT SYSTEMS BACKUP\TOOLS AND INSTALLERS\PROJECTS\BCCS Tool\Source Code\BCCSReportGenerator\frmComputeBCCS.cs line 62

Thank you very much in advance for your help.

[Mitja Bonca]

You will have to use delegates to update the Text property of the label1. Because you want to access from another thread to the main one and update the label`s Text property, you get this error.
You can do it like this:

//delegate void MyDelegate(string message);

private void MyMethod(string msg)
{
     if (this.label1.InvokeRequired)
         this.label1.Invoke(new MyDelegate(MyMethod), new object[] { msg });
    else
      this.label1.Text = msg;
}

Call this method from where do you want to update label.