How to get return value when BeginInvoke/Invoke is called in C#

Question

I\'ve this little method which is supposed to be thread safe. Everything works till i want it to have return value instead of void. How do i get the return value when BeginI

Answer 1

public static string readControlText(Control varControl)
{
    if (varControl.InvokeRequired)
    {
        string res = "";
        var action = new Action(c => res = c.Text);
        varControl.Invoke(action, varControl);
        return res;
    }
    string varText = varControl.Text;
    return varText;
}