>>>>>>>I think there's a simple answer to this but I can't think of it or find it.
>>>>>>>I want to set the character casing of all textboxes on a form to upper.
>>>>>>>I get this far and can't access the charactercasing property of the control.
>>>>>>>Any help appreciated.
>>>>>>>
>>>>>>>

>>>>>>>      foreach (Control c in parentForm.Controls)
>>>>>>>            {
>>>>>>>                if (c is TextBox)
>>>>>>>                {
>>>>>>>
>>>>>>>                }
>>>>>>>            }
>>>>>>>

>>>>>>
>>>>>>Did you try instead (not tested)
>>>>>>

>>>>>>var c as TextBox
>>>>>>
>>>>>>if (c!=null)
>>>>>> {
>>>>>>
>>>>>>  }

>>>>>>
>>>>>>See
>>>>>>
>>>>>>https://msdn.microsoft.com/en-us/library/cscsdfbt.aspx?f=255&MSPPError=-2147217396
>>>>>
>>>>>
>>>>>Thanks, Naomi
>>>>>
>>>>>I woke up from my trance and this did it
>>>>>
>>>>>

>>>>>
>>>>> foreach (Control c in parentForm.Controls)
>>>>>            {
>>>>>                if (c is TextBox)
>>>>>                {
>>>>>                    TextBox tb = c as TextBox;
>>>>>                    tb.CharacterCasing = CharacterCasing.Upper;
>>>>>                }
>>>>>            }
>>>>>

A Linq way:

foreach (Control c in parentForm.Controls.Where(x=>x is TextBox))
>>>>            {
>>>>                ((TextBox)c).CharacterCasing = CharacterCasing.Upper;
>>>>            }

>>>
>>>Thank you, Viv.
>>>I couldn't think of this syntax.
>>>

>>>((TextBox)c).CharacterCasing = CharacterCasing.Upper;
>>>

>>>The one I used worked but I prefer this one and I substituted it.
>>
>>A better LINQ way:
>>

foreach (TextBox c in parentForm.Controls.OfType< TextBox>())
>>            {
>>                c.CharacterCasing = CharacterCasing.Upper;
>>            }

>>Good. I'd forgotten about OfType(). Don't know if it's any faster because, internally, I think it does a 'is X' anyway ?

Performance is probably similar, but it cleans up the code by getting rid of the lambda and cast.