Hi,
Was wondering where we can get the list of error codes in CRM 2011.
For CRM 4.0 we used to have the following link (page in SDK)
http://msdn.microsoft.com/en-in/library/cc151248.aspx
In CRM 2011, we can get it in SDK at the following path
\sdk\samplecode\cs\helpercode
Do check this post as well
http://mscrmuk.blogspot.com/2009/01/crm-error-codes.html
Bye.