DynamicCast() casts an unknown type to a given type. This requires .net 4.0 for dynamics.

gistfile1.cs

/// <summary>
/// Dynamically casts a type to another type without knowing the CLR knowing the object's type. Before calling this method,
/// ensure the object's type matches what you are trying to cast to!
/// </summary>
/// <exception cref="System.InvalidCastException"></exception>
public static dynamic DynamicCast(this Type T, dynamic o)
{
	return typeof(ReflectionHelpers).GetMethod("Cast", BindingFlags.Static | BindingFlags.NonPublic)
		.MakeGenericMethod(T).Invoke(null, new object[] { o });
}

/// <summary>Method used to dynamically cast (through reflection) one type to another type (object to a correct type).</summary>
public static T Cast<T>(object o)
{
	return (T)o;
}