Code For Future

Like me you too came searching for the RichTextField control for SharePoint. But you will be surprised that this is not the one you are looking for.
You must be looking for a control which will allow you to create formatted text as shown in below given image.

InputFormTextBox is the correct control you will ever [...]

Collection was modified; enumeration operation may not execute
This exception is thrown when you are trying to delete items of a collection in a for loop or using a for each loop.
The ideal solution could be to use a for loop with a descending counter.
Problem:
for e.g.
If suppose you are executing any of following code snippets
1.
for [...]