Asp.net form opening and closing (output js)

Copy codeThe Code is as follows:
// Open a new form
Response. Redirect ("WebMain. aspx ");
// A new form is displayed.
Response. Write ("<script> window. open (\" WebMain. aspx \ ") </script> ")
// A confirmation box is displayed.
Response. Write ("<script> alert (\" username or password error \ "); </script> ");
// Close the form. No message is displayed.
Response. Write ("<script> window. opener = null; window. close (); </script> ");
// A message is displayed when the form is closed.
Response. Write ("<script> window. close (); </script> ");
// Two messages are prompted when the form is closed.
Response. Write ("<script> if (confirm (\" are you sure you want to exit? \ ") = True) {window. close () ;}</script> ");