Check if application is installed in registry

After searching and troubleshooting, I got it to work this way:

public static bool checkInstalled (string c_name)
{
    string displayName;

    string registryKey = @"SOFTWARE\Microsoft\Windows\CurrentVersion\Uninstall";
    RegistryKey key = Registry.LocalMachine.OpenSubKey(registryKey);
    if (key != null)
    {
        foreach (RegistryKey subkey in key.GetSubKeyNames().Select(keyName => key.OpenSubKey(keyName)))
        {
            displayName = subkey.GetValue("DisplayName") as string;
            if (displayName != null && displayName.Contains(c_name))
            {
                return true;
            }
        }
        key.Close();
    }

    registryKey = @"SOFTWARE\Wow6432Node\Microsoft\Windows\CurrentVersion\Uninstall";
    key = Registry.LocalMachine.OpenSubKey(registryKey);
    if (key != null)
    {
        foreach (RegistryKey subkey in key.GetSubKeyNames().Select(keyName => key.OpenSubKey(keyName)))
        {
            displayName = subkey.GetValue("DisplayName") as string;
            if (displayName != null && displayName.Contains(c_name))
            {
                return true;
            }
        }
        key.Close();
    }
    return false;
}

And I simply just call it using

if(checkInstalled("Application Name"))

This is a clean way to do this without that much code.

    private static bool IsSoftwareInstalled(string softwareName)
    {
        var key = Registry.LocalMachine.OpenSubKey(@"SOFTWARE\Microsoft\Windows\CurrentVersion\Uninstall") ??
                  Registry.LocalMachine.OpenSubKey(
                      @"SOFTWARE\Wow6432Node\Microsoft\Windows\CurrentVersion\Uninstall");

        if (key == null)
            return false;

        return key.GetSubKeyNames()
            .Select(keyName => key.OpenSubKey(keyName))
            .Select(subkey => subkey.GetValue("DisplayName") as string)
            .Any(displayName => displayName != null && displayName.Contains(softwareName));
    }

Call it with a if-statement:

if (IsSoftwareInstalled("OpenSSL"))

I have checked @Stellan Lindell's code and it doesn't work in all cases. My version should work in all scenarios and checks the specific version of installed programs(x86, x64).

using System;
using System.Collections.Generic;
using System.Linq;
using Microsoft.Win32;

namespace Test
{  
internal class Program
{  
    public enum ProgramVersion
    {
        x86,
        x64
    }

    private static IEnumerable<string> GetRegisterSubkeys(RegistryKey registryKey)
    {
        return registryKey.GetSubKeyNames()
                .Select(registryKey.OpenSubKey)
                .Select(subkey => subkey.GetValue("DisplayName") as string);
    }

    private static bool CheckNode(RegistryKey registryKey, string applicationName, ProgramVersion? programVersion)
    {
        return GetRegisterSubkeys(registryKey).Any(displayName => displayName != null
                                                                  && displayName.Contains(applicationName)
                                                                  && displayName.Contains(programVersion.ToString()));
    }

    private static bool CheckApplication(string registryKey, string applicationName, ProgramVersion? programVersion)
    {
        RegistryKey key = Registry.LocalMachine.OpenSubKey(registryKey);

        if (key != null)
        {
            if (CheckNode(key, applicationName, programVersion))
                return true;

            key.Close();
        }

        return false;
    }

    public static bool IsSoftwareInstalled(string applicationName, ProgramVersion? programVersion)
    {
        string[] registryKey = new [] {
            @"SOFTWARE\Microsoft\Windows\CurrentVersion\Uninstall",
            @"SOFTWARE\Wow6432Node\Microsoft\Windows\CurrentVersion\Uninstall"
        };

        return registryKey.Any(key => CheckApplication(key, applicationName, programVersion));
    }

    private static void Main()
    {
        // Examples
        Console.WriteLine("Notepad++: " + IsSoftwareInstalled("Notepad++", null));
        Console.WriteLine("Notepad++(x86): " + IsSoftwareInstalled("Notepad++", ProgramVersion.x86));
        Console.WriteLine("Notepad++(x64): " + IsSoftwareInstalled("Notepad++", ProgramVersion.x64));
        Console.WriteLine("Microsoft Visual C++ 2009: " + IsSoftwareInstalled("Microsoft Visual C++ 2009", null));
        Console.WriteLine("Microsoft Visual C-- 2009: " + IsSoftwareInstalled("Microsoft Visual C-- 2009", null));
        Console.WriteLine("Microsoft Visual C++ 2013: " + IsSoftwareInstalled("Microsoft Visual C++ 2013", null));
        Console.WriteLine("Microsoft Visual C++ 2012 Redistributable (x86): " + IsSoftwareInstalled("Microsoft Visual C++ 2013", ProgramVersion.x86));
        Console.WriteLine("Microsoft Visual C++ 2012 Redistributable (x64): " + IsSoftwareInstalled("Microsoft Visual C++ 2013", ProgramVersion.x64));
        Console.ReadKey();
    }
}
}