What is the correct way of coping one text box to another using += ...

Glenn Patton

Hi,

Bit of an odd one I am reading back some data an loading it to a rich text box
using the method:

for(int i = 0; i < Max; i++)
rtbData_Back += stringParts[i] +','+'\n' ;

I have noticed some of the data missing when I change it to:
for(int i = 0; i < Max; i++)
rtbData_Back = rtbData_Back + stringParts[i] +','+'\n';

I have not seen error since. I thought += was inherited from C++/Java,
so that can't be the problem, can it?

Glenn

4 Replies

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Vulpes14y ago
Accepted answer
Well, there's absolutely no difference in effect between:

rtbData_Back += stringParts[i] +','+'\n' ;

and:

rtbData_Back = rtbData_Back + stringParts[i] +','+'\n';

Also, the possibility of there being a bug in the += operator is virtually zero.

I think that when you're programming and trying to keep a lot of things in your head at once, you occasionally do get 'rogue' results which appear inexplicable at the time. However, there's always a logical explanation - perhaps you started off with a different value of rtbData_Back, you changed the max variable or you changed one or more of the elements of the stringParts array.
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Glenn Patton14y ago
Thanks
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Vulpes14y ago
Setting a control's Visible property to false is just the same as hiding it by calling its Hide() method.

The control still exists but it's invisible to the user.
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Glenn Patton14y ago
'when you're programming and trying to keep a lot of things in your head at once' Perfect Example also several cups of coffee don't help matters! It is the case of look at what is in stringParts make sure there is no corruption there. Also bit of a Windows question is there any difference between .Visible = true and .Visible = false, the item still exists you just can't see it.
Glenn (Thanks)
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