Export data from SQL SERVER 2008 database to Excel in wpf

Question

Hi, I am seeking for a sample for the function "Export data from SQL SERVER 2008 database to Excel in wpf". I did a lot of research in Google and Stackoverflow, but most of the examples are for web and winform as well. Any one can give me a sample for "Export data from SQL SERVER 2008 database to Excel in wpf"? Thanks in advance. 

Also, I followed a tutorial from google but it does not work for my app. I post a question about the errors and my code in stackoverflow. Can you please take a look in my stackoverflow page, my name is DanielXu, the question name is Export Data from SQL Server database to Excel in WPF  Thanks.