Mutually dependent drop-downs

mscertified

I have 2 drop-downs on my web form. I need to make the contents of the second
one dependent on the choice from the first. How? I tried removing the
existing entries from the second listbox and reloading with new values but I
got an error "collection was modified, enumeration operation may not
execute". I am clueless what this means.

Nov 9 '06 #1

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1183

Marina Levit [MVP]

Well, it would be very helpful if you showed the code you were running when
this exception is thrown. We can't guess what code you have written.

I suspect you have a for each loop and you are trying to modify the
collection you are looping through. Just a guess since you didn't bother
posting the code.

"mscertified" <ru****@tigerlily.comwrote in message
news:05**********************************@microsof t.com...

>I have 2 drop-downs on my web form. I need to make the contents of the
second
one dependent on the choice from the first. How? I tried removing the
existing entries from the second listbox and reloading with new values but
I
got an error "collection was modified, enumeration operation may not
execute". I am clueless what this means.

Nov 9 '06 #2

mscertified

I have it working now, I just replaced the FOR...EACH loop with a DO WHILE
loop and now it works perfectly.

"Marina Levit [MVP]" wrote:

Well, it would be very helpful if you showed the code you were running when
this exception is thrown. We can't guess what code you have written.

I suspect you have a for each loop and you are trying to modify the
collection you are looping through. Just a guess since you didn't bother
posting the code.

"mscertified" <ru****@tigerlily.comwrote in message
news:05**********************************@microsof t.com...
I have 2 drop-downs on my web form. I need to make the contents of the
second
one dependent on the choice from the first. How? I tried removing the
existing entries from the second listbox and reloading with new values but
I
got an error "collection was modified, enumeration operation may not
execute". I am clueless what this means.

Nov 9 '06 #3

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Mutually dependent drop-downs

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