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I have a table in my DB called CompanyDetails . It has a column called CharacterID varchar(255) . I just changed it from a NOT NULL column to a NULL column. I ran the 'Update Model From Database...' command in the model browser as well as in the EDMX file viewer. This is what it created in the designer: /// <summary> /// There are no comments for Property CharacterId in the schema. /// </summary> [global::System.Data.Objects.DataClasses.EdmScalarPropertyAttribute(IsNullable=false)] [global::System.Runtime.Serialization.DataMemberAttribute()] public string CharacterId { get { return this._CharacterId; } set { this.OnCharacterIdChanging(value); this.ReportPropertyChanging("CharacterId"); this._CharacterId = global::System.Data.Objects.DataClasses.StructuralObject.SetValidValue(value, false); this.ReportPropertyChanged("CharacterId"); this.OnCharacterIdChanged(); } } private string _CharacterId; partial void OnCharacterIdChanging(string value); partial void OnCharacterIdChanged(); /// <summary> /// There are no comments for Property URLDomain in the schema. /// </summary> [global::System.Data.Objects.DataClasses.EdmScalarPropertyAttribute()] [global::System.Runtime.Serialization.DataMemberAttribute()] public string URLDomain { get { return this._URLDomain; } set { this.OnURLDomainChanging(value); this.ReportPropertyChanging("URLDomain"); this._URLDomain = global::System.Data.Objects.DataClasses.StructuralObject.SetValidValue(value, true); this.ReportPropertyChanged("URLDomain"); this.OnURLDomainChanged(); } } private string _URLDomain; partial void OnURLDomainChanging(string value); partial void OnURLDomainChanged(); You will notice that it has an attribute of: [global::System.Data.Objects.DataClass

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