Why can't I reference System.ComponentModel.DataAnnotations?

Question

I\'m trying to use DataAnnotations in my WPF project to specify a maximum length of strings, with the following:

using System.ComponentModel.DataAnnotations;         


        

Answer 1

System.ComponentModel.DataAnnotations is contained in its own assembly so you need to make sure you have it refernced. Just simply:

1). Right click on Soloution and choose add.

2). Choose reference from the list.

3). Search " System.ComponentModel.DataAnnotation " and tick the check box on its left hand side and press ok.

Job done, shouldnt have any refernce errors.