Hash encryption password provided by ASP. NET

Use the formsauthentication class provided by ASP. NET to implement the hash encryption password.
Private void loginbutton_click (Object sender, system. eventargs E)
{
String SQL = string. Format ("select password from administrator where adminid = '{0}', useridbox. Text );
Sqlconnection conn = new sqlconnection (configurationsettings. etettings ["connectionstring"]);
Sqldatareader myreader = new sqlcommand (SQL, Conn). executereader ();
If (myreader. Read ())
{
String hashed = Formsauthentication . Hashpasswordforstoringinconfigfile (passwordtextbox. Text, "sha1 ");
// Hash the password entered by the user and then use it with the database Hash Value For comparison
If (hash = myreader ["password"]). tostring ())
{
Formsauthentication. Redirectfromloginpage (Useridbox. Text, true); // go to the request page
}
Else
Result. Text = "Incorrect password ";
}
Else
Result. Text = "the user does not exist ";
Conn. Close ();
}