How can I change source block parameters [Image from File] in a simulink model after every successful run?

I have a simulink model in which there is input image using 'Image from file' block. In this model, we give File Location in parameters which is to be done at once for a single simulation. I want to update this parameter after every run such that the model works for all the images present in a particular directory automatically. How this could be achieved in the model...???