I am building Windows Form application. I have a 3 tables

table1 (Sr, ProjectNum, OpeningDate, ClosingDate)
table2 (sr, ProjectNum, ItemNum, ItemDescription, ItemQty, ItemPrice)
table3 (sr, ProjectNum, Testing)

As I scroll table1 using ProjectNum, I want to displayed accordingly data from table2 and table3 on screen.

I already have got table1 item as textBox using DataSource window, table2 as DataGridView and table3 as DataGridView.

Now I want to associate textbox field of table1 with DataGridView of table2 and table3.
Say I have project num 12112, now I want to display only records with 12112 project number from table2 and table3.

Any Suggestion please??