How to bind Textbox and Datagrid at a time

you can use sql query using where clause.

I think you need to use the Improve question link to add further information to your post. For example I think you are saying that if someone enters a PurNo on the Modify form that you want to display data related to that PurNo on your Purchase form. You need to tell us how are you storing that data in the first place (database? xml? spreadsheet?) and post the code that you have tried so far