Generic Type Creator

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// aufruf
        public void testRun()
        {
            IList<int> var = new List<int>();
            TestMethod(var);
        }
        public void TestMethod(object var)
        {
            if (var.GetType().IsGenericType)
            {
                Type[] t = var.GetType().GetGenericArguments();
                Type typeToGenerate = typeof(Dictionary<,>);
                Type[] tParameters = new Type[] { typeof(Guid), t[0] };
                Type newType = typeToGenerate.MakeGenericType(tParameters);
                object obj = Activator.CreateInstance(newType);
            }
            else
            {
                throw new InvalidCastException("Wrong type");
            }
            // do something with the new Dictionary...
        }