how to encrypt data into database?

public bool CreateEncryptedPassword(string UserName, string Password, out string EncryptedPassword)

        {

            sbFlag = false;

            HashAlgorithm hash = new SHA256Managed();

            // compute hash of the password

            byte[] PasswordBytes = Encoding.UTF8.GetBytes(Password);

            byte[] PasswordhashBytes = hash.ComputeHash(PasswordBytes);

            // create key byte array

            byte[] KeyBytes = Encoding.UTF8.GetBytes(UserName);

            byte[] PasswordWithKeyBytes = new byte[PasswordBytes.Length + KeyBytes.Length];

            for (int i = 0; i < PasswordBytes.Length; i++)

            {

                PasswordWithKeyBytes[i] = PasswordBytes[i];

            }

            // compute Key hash

            byte[] CombinedPasswordKeyBytes = hash.ComputeHash(PasswordWithKeyBytes);

            EncryptedPassword = Convert.ToBase64String(CombinedPasswordKeyBytes);

            if (EncryptedPassword.Length > 0)

            {

                sbFlag = true;

            }

            return sbFlag;

        }

This code will return u the encrypted password for the combination of username and password which will be unique and the password cannot be decriptable so every time u need to get the encrypted password for the combination and then check with the database