Simple Manipulation Task

via .net all files in a specfic needs to be manipulted / changed. The manipulation is that a specific sentence needs to be replaced in an other specific sentence. The updated files needs to be saved in a specific folder. The processed orginal files needs to be moved to a specific folder. What the sentences are and which folders are specified in a designated config file, for example a excel file. With a button that runs a macro to executed the code.