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    <p>Something like this should do it. Just grab the value from the registry</p> <p><strong>For .NET 1-4</strong>:</p> <p><code>Framework</code> is the highest installed version, <code>SP</code> is the service pack for that version.</p> <pre><code>RegistryKey installed_versions = Registry.LocalMachine.OpenSubKey(@"SOFTWARE\Microsoft\NET Framework Setup\NDP"); string[] version_names = installed_versions.GetSubKeyNames(); //version names start with 'v', eg, 'v3.5' which needs to be trimmed off before conversion 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></pre> <p><strong>For .NET 4.5+</strong> (from <a href="https://msdn.microsoft.com/en-us/library/hh925568" rel="nofollow noreferrer">official documentation</a>):</p> <pre><code>using System; 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)); } } } ... // Checking the version using &gt;= will enable forward compatibility, // however you should always compile your code on newer versions of // the framework to ensure your app works the same. private static string CheckFor45DotVersion(int releaseKey) { if (releaseKey &gt;= 461808) { return "4.7.2 or later"; } if (releaseKey &gt;= 461308) { return "4.7.1 or later"; } if (releaseKey &gt;= 460798) { return "4.7 or later"; } if (releaseKey &gt;= 394802) { return "4.6.2 or later"; } if (releaseKey &gt;= 394254) { return "4.6.1 or later"; } if (releaseKey &gt;= 393295) { return "4.6 or later"; } if (releaseKey &gt;= 393273) { return "4.6 RC or later"; } if ((releaseKey &gt;= 379893)) { return "4.5.2 or later"; } if ((releaseKey &gt;= 378675)) { return "4.5.1 or later"; } if ((releaseKey &gt;= 378389)) { return "4.5 or later"; } // This line should never execute. A non-null release key should mean // that 4.5 or later is installed. return "No 4.5 or later version detected"; } </code></pre>
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    1. POIs there an easy way to check the .NET Framework version?
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    1. USted214
    1. USFactor Mystic
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    1. POIs there an easy way to check the .NET Framework version?
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    1. COThe long version string as well as SP subkey for each SOFTWARE\Microsoft\NET Framework Setup\NDP\<.net version> should provide this, which you can grab with the GetValue method.
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      1. USFactor Mystic
    2. COat the v3.5 level there is a key called SP. The value is the service pack level
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      1. USChristopher Klein
    3. CODon't forget to call Close on the Key opened using OpenSubKey!
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      1. USIkaso
 

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