control thread invoke by Radzhab Ahvahsky

public static class ControlEx
{
    public static void Invoke(this System.Windows.Forms.Control @this, Action action)
    {
        if (@this == null) throw new ArgumentNullException("@this");
        if (action == null) throw new ArgumentNullException("action");
        if (@this.InvokeRequired)
        {
            @this.Invoke(action);
        }
        else
        {
            action();
        }
    }
}

txtbox1.Invoke(() => toolStripProgressBar1.Value = value);