How to read registry value correctly in C#

Question

I have created a key of type string and named it mykey in registry at HKEY_USERS\.DEFAULT with the value set to 1234.

I have a windows form application with a button on it.

I want to see the value of mykey in a MessageBox whenever the button is pressed. How can I achieve that?

This is what I did. But this code only shows HKEY_USERS in the MessageBox and not the value of mykey.

private void button1_Click(object sender, EventArgs e)
    {
        RegistryKey rk = Registry.Users;
        rk.GetValue("HKEY_USERS\\.DEFAULT\\mykey");

        if (rk == null)
            MessageBox.Show("null");
        else
            MessageBox.Show(rk.ToString());
    }

Answer 1

You have specified User two times but you have to do that anyone of that, here is the safe way to read registry value

private void button1_Click(object sender, EventArgs e)
    {
        using (RegistryKey key = Registry.Users.OpenSubKey(".DEFAULT"))
        {
            if (key != null)
            {
                Object val = key.GetValue("mykey");
                if (val != null)
                {
                    MessageBox.Show(val.ToString());
                }
                else
                {
                   MessageBox.Show("Null");
                }
            }

        }
    }