How do you write a program in Visual Basic that allows the user to input 5 values at a time (using a textbox) for an infinite amount of times, and then recalculate the upper and lower control limits each time the user inputs a new set of 5 values. These 5 values are displayed on a data grid view and displayed on 2 graphs (i know how to do this part). My problem is the program should pretty much erase the pervious series data points for the control limits for both charts and update the new value with the recalculated values, and I am not sure how to do this. Thank you!