Asp. NET Hash encrypted 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.appsettings["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 compare it to the hash value of the database

if (hash==myreader["password"]). ToString ())

{

FormsAuthentication.RedirectFromLoginPage (useridbox.text,true);/Go to request page

}

Else

result.text= "Password Error";

}

Else

result.text= "User does not exist";

Conn. Close ();

}