protected void Bsubmit_Click(object sender, EventArgs e)
    {
        SqlConnection conn = new SqlConnection("Server=.; Database=LoginDatabase; Trusted_Connection=True;");
        conn.Open();
        SqlCommand cmd = new SqlCommand("select Passhash from Userdata where Username=@Username", conn);
        cmd.Parameters.AddWithValue("@UserName", Uname.Text);
        string sPassword = (string)cmd.ExecuteScalar();
        if (sPassword == Pword.Text)
        {
            string passwordrehash = BCrypt.Net.BCrypt.HashPassword(Uname.Text, 13);
            SqlCommand update = new SqlCommand("Update Userdata set Passhash=@PHash Where Username=@Username", conn);
            update.Parameters.AddWithValue("@Username", Uname.Text);
            update.Parameters.AddWithValue("@PHash", passwordrehash);
            update.ExecuteNonQuery();
        }
        else if (BCrypt.Net.BCrypt.PasswordNeedsRehash(sPassword, 13))
        {
            string passwordrehash = BCrypt.Net.BCrypt.HashPassword(Uname.Text, 13);
            SqlCommand update = new SqlCommand("Update Userdata set Passhash=@PHash Where Username=@Username", conn);
            update.Parameters.AddWithValue("@UserName", Uname.Text);
            update.Parameters.AddWithValue("@PHash", BCrypt.Net.BCrypt.HashPassword(Uname.Text, 13));
            update.ExecuteNonQuery();
        }
        else
        {

        }