InstalledInstances dont work?

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C#

database

hi everyone,

I have a proje with database and I have to create a setup file to run another computer. I try to setup but firstly, I need to know is there any MSSQLSERVER in computer. I searched some code about it and I found this code.

RegistryKey rk = Registry.LocalMachine.OpenSubKey("\\SOFTWARE\\Microsoft\\Microsoft SQL Server");
                String[] instances = (String[])rk.GetValue("InstalledInstances");

but everytime instances equal null everytime. but when I try to look myself on computer I find by hand. whats the wrong this code?

RegistryKey rk = Registry.LocalMachine.OpenSubKey("\\SOFTWARE\\Microsoft\\Microsoft SQL Server");
                String[] instances = (String[])rk.GetValue("InstalledInstances");
               
                if (instances.Length > 0)
                {
                    foreach (String element in instances)
                    {

                        if (element == "MSSQLSERVER")
                        {
                            DialogResult res = MessageBox.Show("are u sure to setup this file?", "UYARI", MessageBoxButtons.YesNo);
                            if (res == DialogResult.Yes)
                            {
                                string path = Environment.GetFolderPath(Environment.SpecialFolder.MyDocuments) + "\\SQLEXPR.EXE";
                                Process p = new Process();
                                p.StartInfo.FileName = path;
                                
                                p.StartInfo.Arguments = "/qb INSTANCENAME=\"SQLEXPRESS\" INSTALLSQLDIR=\"C:\\Program Files\\Microsoft SQL Server\" INSTALLSQLSHAREDDIR=\"C:\\Program Files\\Microsoft SQL Server\" INSTALLSQLDATADIR=\"C:\\Program Files\\Microsoft SQL Server\" ADDLOCAL=\"All\" SQLAUTOSTART=1 SQLBROWSERAUTOSTART=0 SQLBROWSERACCOUNT=\"NT AUTHORITY\\SYSTEM\" SQLACCOUNT=\"NT AUTHORITY\\SYSTEM\" SECURITYMODE=SQL SAPWD=\"\" SQLCOLLATION=\"SQL_Latin1_General_Cp1_CS_AS\" DISABLENETWORKPROTOCOLS=0 ERRORREPORTING=1 ENABLERANU=0";
                              
                                p.StartInfo.CreateNoWindow = true;
                              
                                p.StartInfo.WindowStyle = ProcessWindowStyle.Hidden;
                                p.Start();
                                
                                p.WaitForExit();
                                CreateDB();

                            }
                            else
                            {
                                
                                this.Close();
                            }
                        }
                    }
                }