BeginInvoke on PropertyInfo of Items property for ComboBox

Question

Dear Fellows,

The below written code works when i try to take the items Collection

as a whole and then apply index to it. outside of BeginInvoke.

//propName = ComboBoxProperties.Items; 

PropertyInfo comboItems = typeof(ComboBox).GetProperty( propName.ToString().Trim() ) ;

var a = comBox_.BeginInvoke(new Func<object, Object>(comboItems.GetValue), comBox_); 

object c = null;

c = comBox_.EndInvoke(a);

retVal = (((ComboBox.ObjectCollection)c)[(int)propIndex]);

 

but when i try to apply index inside BeginInvoke itself it does not work gives an exception of 

An unhandled exception of type 'System.Reflection.TargetInvocationException' occurred in mscorlib.dll

Additional information: Exception has been thrown by the target of an invocation.

i.e when i do like this

delegate object getItemDlg ( object comBox, object[] index );   

PropertyInfo comboItems = typeof(ComboBox).GetProperty( propName.ToString().Trim() ) ; object[] index = { propIndex };  

var a = comBox_.BeginInvoke( new getItemDlg(comboItems.GetValue), comBox_, index ); object c = null;

c = comBox_.EndInvoke(a);
retVal = c;

i have tried using Func<object,object[],object> and

var a = comBox_.BeginInvoke( new getItemDlg(comboItems.GetValue), new object[]{ comBox_, index });

but to no avail

specifically i would like to know how does one get indexed properties with begin invoke

Thanks

Regards