You don't feed the file, you feed the data... you need to...

1. Get the data from the text file.

2. Store it in a format needed by the chart control.

3. Feed the data to the chart control (usually by setting ChartData, or adding values to a Series, etc...)

If you need help with the individual steps, or having errors reading a file, not sure how to store the values in a list or array, etc etc... you can ask and you will probably get more help on those specific types of issues. It's hard for people to help when it is just sort of a wide open project and we don't know what the requirements are, what type of chart control you are using, etc.