How Can I Determine My Installed .NET Framework Version and Service Pack?

Identifying Your .NET Framework Version:

This guide details how to accurately determine your installed .NET Framework version, including the Service Pack (SP) level for version 3.5. We'll explore several approaches.

Registry-Based Approach (for .NET 1-4):

The Windows Registry contains information about installed .NET Framework versions. The following code snippet demonstrates how to extract this data:

<code class="language-csharp">RegistryKey installed_versions = Registry.LocalMachine.OpenSubKey(@"SOFTWARE\Microsoft\NET Framework Setup\NDP");
string[] version_names = installed_versions.GetSubKeyNames();
double Framework = Convert.ToDouble(version_names[version_names.Length - 1].Remove(0, 1), CultureInfo.InvariantCulture);
int SP = Convert.ToInt32(installed_versions.OpenSubKey(version_names[version_names.Length - 1]).GetValue("SP", 0));</code>

Microsoft's Recommended Method for .NET 4.5 and Later:

Microsoft's official documentation recommends a different registry-based approach for .NET Framework 4.5 and subsequent versions:

<code class="language-csharp">using Microsoft.Win32;


...


private static void Get45or451FromRegistry()
{
    using (RegistryKey ndpKey = RegistryKey.OpenBaseKey(RegistryHive.LocalMachine, RegistryView.Registry32).OpenSubKey("SOFTWARE\Microsoft\NET Framework Setup\NDP\v4\Full\")) {
        int releaseKey = Convert.ToInt32(ndpKey.GetValue("Release"));
        if (true) {
            Console.WriteLine("Version: " + CheckFor45DotVersion(releaseKey));
        }
    }
}


...


private static string CheckFor45DotVersion(int releaseKey)
{
    // Implementation for checking .NET 4.5 version and above
}</code>

These methods offer a precise and efficient way to identify your installed .NET Framework version and its associated Service Pack (for version 3.5), avoiding lengthy manual searches.

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