从多个aspx网页将数据插入SQL数据库表

I am currently have an asp.net web site through visual studio that contains three .aspx pages. Each .aspx page has simple label and text box fields in it. There is a button in each web aspx page also that redirects to the second and third page as well as a submit button at the end of the third page. Also behind the buttons there is an sql command/ query that Inserts the input from the textboxes into an sql database. I have one table in the database that I want input from all three pages. When I tried to do this the input from the first page correctly stayed in the first row. Then the input from the second page made its own second row and so on... I am also using a INSERT statement for each web aspx page. I have a picture below of what the database looks like... how can I get all the input into one rowI am currently have an asp.net web site through