create following store procedure
CREATE PROCEDURE [InsertRegistration] @fname VARCHAR(50),@lname VARCHAR(50),
@uname VARCHAR(50),@passwo VARCHAR(50),@repasswo VARCHAR(50),@email VARCHAR(50),
@contact VARCHAR(50),@gender VARCHAR(50)ASBEGIN INSERT INTO regis ( fname ,
lname , uname , passwo , repasswo, email, contact , gender , email )
VALUES ( @fname, @lname, @uname , @passwo , @repasswo , @email ,
@contact , @gender, @email ) INSERT INTO details ( contact, email )
VALUES ( @contact , @email )END
to call Store Procedure refer :http://www.aspsnippets.com/Articles/Calling-Insert-SQL-Server-Stored-Procedures-using-ADO.Net.aspx