Cross-thread operation not valid: Control 'statusStrip' accessed from a thread other than the thread it was created on

I Have try this. http://ift.tt/1FR6Z1s

like toolStripStatusLabel1.InvokeRequired

but toolStripStatusLabel1 has no InvokeRequired

and I has try this too. http://ift.tt/1F2f1WI

and it error like invalid argument on

SetTextCallback d = new SetTextCallback(SetText);
form.Invoke(d, new object[] { form, ctrl, text });

when I use

ThreadHelperClass.SetText(this, toolStripStatusLabel1, "This text was set safely.");

but not error when I use textBox