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Editorial Team
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Asked: 2026-05-27T17:10:19+00:00

I’m trying to read the registry key RPSessionInterval from the subkey HKLM\SOFTWARE\Microsoft\Windows NT\CurrentVersion\SystemRestore in

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I’m trying to read the registry key “RPSessionInterval” from the subkey “HKLM\SOFTWARE\Microsoft\Windows NT\CurrentVersion\SystemRestore” in C#. I’m using the following code and getting the exception “Object reference not set to an instance of an object.”

string systemRestore = @"SOFTWARE\Microsoft\Windows NT\CurrentVersion\SystemRestore";
RegistryKey baseRegistryKey = Registry.LocalMachine;
public string SystemRestoreStatus(string subKey, string keyName)
{
    RegistryKey rkSubKey = baseRegistryKey.OpenSubKey(systemRestore);
    if (rkSubKey != null)
    {
        try
        {
            string sysRestore = rkSubKey.GetValue("RPSessionInterval").ToString();
            if (string.Compare(sysRestore, "1") == 0)
            {
                MessageBox.Show("System Restore is Enabled!");
                return "System Restore is Enabled!";
            }
            else if (string.Compare(sysRestore, "0") == 0)
            {
                MessageBox.Show("System Restore is Disabled!");
                return "System Restore is Disabled!";
            }
            else
            {
                return null;
            }
        }
        catch (Exception ex)   //This exception is thrown
        {
            MessageBox.Show("Error while reading registry key: " + subKey + "\\" + keyName + ". ErrorMessage: " + ex.Message, "Error", MessageBoxButtons.OK, MessageBoxIcon.Error);
            return null;
        }
    }
    else
    {
        MessageBox.Show("Error while reading registry key: " + subKey + "\\" + keyName + " does not exist!", "Error", MessageBoxButtons.OK, MessageBoxIcon.Error);
        return null;
    }
}

Here is a picture showing that the registry key actually exists:

Image

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1 Answer

  1. Editorial Team

    You probably have the wrong bitness for your C# application. By default, a Visual Studio 2010 C# project will compile to x86 (32-bit). A 32-bit application running on a 64-bit OS can generally only access the 32-bit registry, the contents of which are often different than the native 64-bit registry. Change the architecture to “Any CPU” or “x64” and it may work.

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