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Is this the fastest way to update a property using reflection? Assume the property is always an int:
PropertyInfo counterPropertyInfo = GetProperty();
int value = (int)counterPropertyInfo.GetValue(this, null);
counterPropertyInfo.SetValue(this, value + 1, null);
Just be sure that you are caching the PropertyInfo somehow, so that you aren’t repeatably calling type.GetProperty. Other than that it would probably be faster if you created a delegate to a method on the type that performed the increment, or like Teoman suggested make the type implement an interface and use that.