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  1. PO
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    <p><strong>EDIT</strong>: Update to reflect changes to handle interface types.<br> <strong>EDIT</strong>: Extra function added to support more than 2 types.</p> <p>First of all: A type cannot be an instance of another type (except when we are talking about an instance of type <code>Type</code>.) Only an object can be an instance of a type.</p> <p>Types can be subtypes of each other (using <code>IsSubType</code>). Types can be assignable to another type (using <code>IsAssignableFrom</code>).</p> <p>To find a common type, try this example. This will always produce a common type (object):</p> <pre><code> /// &lt;summary&gt; /// Returns the most common type of two types. /// If no common type can be found, null is returned. /// &lt;/summary&gt; static public Type GetCommonBaseClass(Type a, Type b) { if ((a == null) || (b ==null)) return null; if (a.IsInterface || b.IsInterface) return null; if (a.IsAssignableFrom(b)) return a; while (true) { if (b.IsAssignableFrom(a)) return b; b = b.BaseType; } } /// &lt;summary&gt; /// Returns the most common type of one or more types. /// If no common type can be found, null is returned. /// &lt;/summary&gt; static public Type GetCommonBaseClass(params Type[] types) { if ((types == null) || (types.Length == 0)) return null; Type type = types[0]; for (int i = 0; i &lt; types.Length; i++) type = GetCommonBaseClass(type, types[i]); return type; } </code></pre> <p>And called from your function:</p> <pre><code>public Type GetTestClass(Object left, Object right) { return GetCommonBaseClass(left.GetType(), right.GetType()); } </code></pre>
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    1. POCompare objects and determine common type
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    1. USMartin Mulder
    1. USMartin Mulder
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    1. COThis will not "always produce a common type". Try using disjoint interfaces.
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    2. COWhat is a "disjoint" interfaces? Can you give me an example?
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      1. USMartin Mulder
    3. COIn this context, two disjoint interfaces are two interfaces such that neither inherits the other. E.g. `IComparable` and `IEnumerable` are disjoint, whereas `IQueryable` and `IEnumerable` are not. Get it?
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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.

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