[Solved] C# How to add to list class?

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You need to instantiate the Lists in your AddedContacts class’s constructor:

public class AddedContacts
{
    private List<CreateContact> Contact;

    public List<CreateContact> ClassCreateContact
    {
        get { return Contact; }
        set { this.Contact = value; }
    }

    public AddedContacts()
    {
        Contact = new List<CreateContact>();
        ClassCreateContact = new List<CreateContact>();
    }

}

You also need to create an instance of AddedContacts to work with and finally you need to watch case: It is Add not add:

 AddedContacts AC = new AddedContacts();
 AC.ClassCreateContact.Add(p);

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solved C# How to add to list class?