SQL how to remove duplicate results from same table

I created an sql table on visual studio for visual basic, where i can put dynamic data every time i click on a button. I get the table results from textboxes and one datagridview with values(quantity,price,discount). I use the "command insert values into" inside a for loop to be able to get all the datagridview results. The problem is that the table has rows with duplicate values. I want to remove the duplicate values and keep only the values from datagridview e.g I have a table with the following format: