here's my problem when i write a string in string box .. it shoulld be there only untill 1 execution, and i can write another string in the box it should also be there until 2nd execution only and so on..
You posted your question into an old message thread that has nothing to do with the question you are asking. Your message as been moved to its own message thread.
I can't help you because your VI is in LV 2016 which I don't have installed. If you saved it back using Save for Previous Version by a version or two, then I could look at it.
I don't know what you mean by "only until 1 execution". If you want something to appear into a string indicator, let's say during 1 iteration of a loop, then not be there during the next iteration, then you need to write an empty string to that string indicator on the following iteration.