HOW TO GET RECORD IN GRIDVIEW FROM SELECTED VALUE IN TEXTBOX

Question

I HAVE TWO FORMS,ONE FORM CONTAINS ONE  ITEXTBOX AND VIEW BUTTON.ANOTHER FORM CONTAINS GRID.I HAVE SERIES LIKE MAIN,SUB,ALL ARE LISTED IN THAT TEXTBOX CORRESPONDING TO LISTBOX.WHEN I CLICK VIEW BUTTON I SHOULD DISPLAY  IN  GRID ,THAT PARTICULAR SERIES WHICH I SELECT IN TEXTBOX AND THAT SERIES IS ALREADY INSERTED.DOING 3 TIER CODE IN  C#.HOW TO GET IN DETAIL?