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Follow below links that may help you:
http://www.dhirajranka.com/2011/05/image-to-database-and-from-database-to-picturebox-control-c/
http://www.msdotnet.co.in/2014/04/how-to-save-image-in-database-and.html#.WbTI-bKg_IU
https://stackoverflow.com/questions/17806794/how-to-store-image-in-sql-using-c-sharp-windows-forms
Note: Use varbinary data type in sqlserver to store image instead of image data type because it will be depecated.