Cybercrux

Everything is achievable through technology

check if program/application is installed

string regKey = @"SOFTWARE\Microsoft\Windows\CurrentVersion\Uninstall";
using (Microsoft.Win32.RegistryKey key = Registry.LocalMachine.OpenSubKey(regKey))
{
if (key.GetSubKeyNames().Any(keyName => key.OpenSubKey(keyName).GetValue("DisplayName") == "My App's Display Name"))
Console.WriteLine("Already installed...");
else
Console.WriteLine("Start installing...");
}

OR


public static bool IsApplictionInstalled(string p_name)
{
string displayName;
RegistryKey key;

// search in: CurrentUser
key = Registry.CurrentUser.OpenSubKey(@”SOFTWARE\Microsoft\Windows\CurrentVersion\Uninstall”);
foreach (String keyName in key.GetSubKeyNames())
{
RegistryKey subkey = key.OpenSubKey(keyName);
displayName = subkey.GetValue(“DisplayName”) as string;
if (p_name.Equals(displayName, StringComparison.OrdinalIgnoreCase) == true)
{
return true;
}
}

// search in: LocalMachine_32
key = Registry.LocalMachine.OpenSubKey(@”SOFTWARE\Microsoft\Windows\CurrentVersion\Uninstall”);
foreach (String keyName in key.GetSubKeyNames())
{
RegistryKey subkey = key.OpenSubKey(keyName);
displayName = subkey.GetValue(“DisplayName”) as string;
if (p_name.Equals(displayName, StringComparison.OrdinalIgnoreCase) == true)
{
return true;
}
}

// search in: LocalMachine_64
key = Registry.LocalMachine.OpenSubKey(@”SOFTWARE\Wow6432Node\Microsoft\Windows\CurrentVersion\Uninstall”);
foreach (String keyName in key.GetSubKeyNames())
{
RegistryKey subkey = key.OpenSubKey(keyName);
displayName = subkey.GetValue(“DisplayName”) as string;
if (p_name.Equals(displayName, StringComparison.OrdinalIgnoreCase) == true)
{
return true;
}
}

// NOT FOUND
return false;
}

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