how to update the password of a particular email

Question

There are two text boxes.

textbox1.text contains the email id

textbox2.text contains the password which is to be updated .

these two textbxes are connected with the database. When a particular emailID is inserted in textbox1.text and password is wriiten then on click submit button the password will automatically gets updated into the database of that particular emailID. 

 

Please Help Me in this to write a code in "WINDOW BASED APPLICATION using c#.."