Update SHA256 hashing into SQL Server Database in C# -


i want hash user password in sql server c#, followed instruction found in http://www.codeproject.com/articles/608860/understanding-and-implementing-password-hashing link , created user table 3 columns 

userid nvarchar(250) userpassword nvarchar(max) usersalt nvarchar(50).

it works fine when insert user , can log in correctly, when update userpassword , usersalt, can not log in updated user, saying userpassword , usersalt incorrect.

any advise follow?


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