step 1. Right click on the Project Name
step 2. Select "Properties" (last option in menu)
step 3. Select "Build" from left hand side options and scroll till down
step 4. click on "Advance" button.
step 5. It will open a popup and there you will get "Language Version" dropdown
step 6. Select desired version of C# and Click "OK"
using System;
using Microsoft.Win32;
public class GetDotNetVersion
{
public static void Main()
{
Get45PlusFromRegistry();
}
private static void Get45PlusFromRegistry()
{
const string subkey = @"SOFTWARE\Microsoft\NET Framework Setup\NDP\v4\Full\";
using (var ndpKey = RegistryKey.OpenBaseKey(RegistryHive.LocalMachine, RegistryView.Registry32).OpenSubKey(subkey))
{
if (ndpKey != null && ndpKey.GetValue("Release") != null) {
Console.WriteLine($".NET Framework Version: {CheckFor45PlusVersion((int) ndpKey.GetValue("Release"))}");
}
else {
Console.WriteLine(".NET Framework Version 4.5 or later is not detected.");
}
}
// Checking the version using >= enables forward compatibility.
string CheckFor45PlusVersion(int releaseKey)
{
if (releaseKey >= 528040)
return "4.8 or later";
if (releaseKey >= 461808)
return "4.7.2";
if (releaseKey >= 461308)
return "4.7.1";
if (releaseKey >= 460798)
return "4.7";
if (releaseKey >= 394802)
return "4.6.2";
if (releaseKey >= 394254)
return "4.6.1";
if (releaseKey >= 393295)
return "4.6";
if (releaseKey >= 379893)
return "4.5.2";
if (releaseKey >= 378675)
return "4.5.1";
if (releaseKey >= 378389)
return "4.5";
// This code 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";
}
}
}
// This example displays output like the following:
// .NET Framework Version: 4.6.1