Excel Cell Format Wrap Text

Hello Team,

I have used OpenXml to update a sheet in excel file. I have achieved this by referring the MSDN

http://msdn.microsoft.com/en-us/library/hh180830(v=office.14).aspx

Now i am updating an excel cell with large text separated by '\n'. I need to set theWrap Text to the cell through OpenXMl C#. With out wrap text the string is appearing in one line which is disappointed.

I have tried to add a style sheet through code, i got exception "only one instance can be allowed"

Please provide a solution to give wrap text to a cell in excel using open xml. My code is similar to the MSDN 

Any help is appritiated

Thanks & Regards,

Programmer Kadapa