Merge pull request #481 from larsw/patch-1

Added section for SQL Server files

CSharp.gitignore

@@ -107,3 +107,7 @@ Generated_Code #added for RIA/Silverlight projects
 _UpgradeReport_Files/
 Backup*/
 UpgradeLog*.XML
+
+# SQL Server files
+App_Data/*.mdf
+App_Data/*.ldf