Databases
StackOverflow2013
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    <p>Use separate entity to store relationships between objects. Like this:</p> <pre><code>[TestFixture] public class Tester { [Test] public void SetY() { var refs = new References(); var x = new X(refs); var y = new Y(refs); x.Y = y; Assert.AreSame(x.Y, y); Assert.AreSame(y.X, x); } [Test] public void SetYToNull() { var refs = new References(); var x = new X(refs); var y = new Y(refs); x.Y = y; y.X = null; Assert.IsNull(x.Y); Assert.IsNull(y.X); } } public class References { private IDictionary&lt;X, Y&gt; refs = new Dictionary&lt;X, Y&gt;(); public bool Contains(X x, Y y) { if (!refs.ContainsKey(x)) return false; if (refs[x] != y) return false; return true; } public void Delete(X x) { refs.Remove(x); } public void Add(X x, Y y) { refs.Add(x, y); } public Y Get(X x) { return refs.ContainsKey(x) ? refs[x] : null; } public X Get(Y y) { var pairs = refs.Where(r =&gt; r.Value == y); return pairs.Any() ? pairs.FirstOrDefault().Key : null; } public void Delete(Y y) { X x = Get(y); if (x != null) { Delete(x); } } } public class X { private readonly References refs; public X(References refs) { this.refs = refs; } public Y Y { get { return refs.Get(this); } set { if (value == null) { refs.Delete(this); } else { if (!refs.Contains(this, value)) { refs.Add(this, value); } } } } } public class Y { private References refs; public Y(References refs) { this.refs = refs; } public X X { get { return refs.Get(this); } set { if (value == null) { refs.Delete(this); } else { if (!refs.Contains(value, this)) { refs.Add(value, this); } } } } } </code></pre>
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    1. POMaintain one to one mapping between objects
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    1. USYauheni Sivukha
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Guidance
A row detail

Detail views are divided into sections. All the information in the data section comes from columns in the selected row. The other sections display data from other, related rows.

Related data can be related in a to-one or a to-many fashion. Captions of data related in a to-many fashion link to a list view showing a filtered view of the table.

Try moving around until you find a non-empty to-many entry and click on the label to get to one. You can move back to the root by clicking on the database name in the header.

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