GetControlPropertyValue code won't compile

I am struggling through a BackgroundWorker problem which is new to me and have been seeking help to get it working properly.  I have received some expert comments but one of the methods suggested will not compile.  Since that question is not getting any replies now, I am trying to break the problem into smaller pieces so that someone will help with the smaller part of the problem.

Here's the code:

delegate object GetControlValueCallback(Control ctrl, string propertyName);
 
private object GetControlPropertyValue(Control ctrl, string propertyName)
{
    if (ctrl.InvokeRequired)
    {
        GetControlValueCallback d = new GetControlValueCallback(GetControlPropertyValue);
        return ctrl.Invoke(d, new object[] { ctrl, propertyName});
    }
    else
    {
        Type t = ctrl.GetType();
        PropertyInfo[] props = t.GetProperties();
        foreach (PropertyInfo p in props)
        {
            if (p.Name.ToUpper() == propertyName.ToUpper())
            {
                return p.GetValue(ctrl, propertyValue);
            }
        }
    }
}

Unfortunately I get the following error when trying to compile:

Error      3      The name 'propertyValue' does not exist in the current context

Any suggestions would be greatly appreciated!