I want to update the tables with Textboxes in C#.

[ImagjneAlex]

Good evening everyone, I have a code that I need to write friends. I have completed everything except for the update, but I have spent all day on it, tried everything, and couldn't figure it out. I either couldn't do it or the ones I found online were wrong, so I decided to ask you. Thank you in advance to those who take the time to help. MY ISSUE: I HAVE 4 TABLES AND I WANT TO UPDATE THEM WITH TEXTBOXES IN C#. SINCE THE TABLES ARE INTERCONNECTED, I CANNOT UPDATE THEM INDIVIDUALLY. HOW CAN I DO THIS WITH A SINGLE UPDATE STATEMENT? I TRIED USING INNER JOINS BUT IT DIDN'T WORK.