Print in c# windows application

It depends what do you want, if you want formatted one then create DOCX (Word document) and send it for print. If your job can be done without formatting then create text file.

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To print a bill in C# application you can achieve through following: 

http://msdn.microsoft.com/en-us/library/system.drawing.printing.printdocument.aspx

and there is very nice article by Mahesh 
http://www.c-sharpcorner.com/UploadFile/mahesh/printfile06062007133250PM/printfile.aspx