Get if Registry entry exists if so do this, if not do that.

Question

so in my registry i have the entry under "LocalMachine\SOFTWARE\Microsoft\Windows\CurrentVersion\Run\" called "COMODO Internet Security" which is my firewall. Now what id like to know is how cani get the registry to check if that entry exists? if it does do this if not then do that. i know how to check if the subkey "Run" exists but not the entry for "COMODO Internet Security", this is the code i was useing to get if the subkey exists

                using (RegistryKey Key = Registry.LocalMachine.OpenSubKey(@"SOFTWARE\Microsoft\Windows\CurrentVersion\Run\"))
                if (Key != null)
                {

                    MessageBox.Show("found");
                }
                else
                {
                    MessageBox.Show("not found");
                }

Answer 1

If you're looking for a value under a subkey, (is that what you mean by "entry"?) you can use RegistryKey.GetValue(string). This will return the value if it exists, and null if it doesn't.

For example:

using (RegistryKey Key = Registry.LocalMachine.OpenSubKey(@"SOFTWARE\Microsoft\Windows\CurrentVersion\Run\"))
    if (Key != null)
    {    
        string val = Key.GetValue("COMODO Internet Security");
        if (val == null)
        {
            MessageBox.Show("value not found");
        }
        else
        {
            // use the value
        }
    }
    else
    {
        MessageBox.Show("key not found");
    }

Answer 2

The following link should clarify this:

How to check if a registry key / subkey already exists

Sample code:

using Microsoft.Win32;

RegistryKey rk = Registry.LocalMachine.OpenSubKey("Software\\Geekpedia\\Test");

if(rk != null)
{
   // It's there
}
else
{
   // It's not there
} 

Answer 3

This will do it:

using (RegistryKey Key = Registry.LocalMachine.OpenSubKey(@"SOFTWARE\Microsof\Windows\CurrentVersion\Run\COMODO Internet Security"))
{
  if (Key != null)
    MessageBox.Show("found");
  else
    MessageBox.Show("not found");
}