Error while executing web part: System.StackOverflowException: Operation caused a stack overflow

Question

Hello All,
I have a list with about 70 or so columns. When I try to access a NewForm for this list, I get an 'Unable to display this web part' error.
Looking at the Correlation always says it is a:
"Error while executing web part: System.StackOverflowException: Operation caused a stack overflow."
I have read many pages on the internet that it is due to an XsltTransformTimeOut value set to 1. I have applied the Feb 2012 CU and tried changing the value to 5, 10, 150, 250 and each time I reset IIS before I tried loading the form again. Each one has
failed and the correlation says the same thing (stack overflow).
I do not know what to do next because every page on the net says it is from that timeout value but I have followed the steps properly to change it but nothing has worked.
Thank you for your help!

Answer 1

You may be exceeding the number of columns threshold with 70 or so columns in your list.
Take a look at the Column limits here:
http://technet.microsoft.com/en-us/library/cc262787.aspx#Column
Okay, so please help me to understand this. It says the maximum value for single line of text is 276 and the size per column is 28 bytes. How would I know if I have pushed the limit? I just multiplied 28 x the number of single line of text columns in that
list and the answer is 840. I do have many other columns, such as multiple lines of text and choice. I do not know if the theory above is correct though, because 28 does not go evenly into 276 (276/28 = 9.857)
Please help me understand how to calculate my fields to see if I have went beyond the limits.
Thank you!