Sentinel Hl Basic protect vendor code

I use bellow code to protect a piece of .net program. We chose to use api instead of classic Envelope method as we want custom behavior not just the normal window "Key not found"

My question is how i can protect the vendor code as it can be seen as plain text in decompiler ?

Thanks in advance.

    HaspFeature feature = HaspFeature.Default;

// Key bellow is random generated.....
    string vendorCode = 
    "AzIceaqfA1hX5wS+M8cGnYh5ceevUnOZIzJBbXFD6dgf3tBkb9cvUF/Tkd/iKu2fsg9wAysYKw7RMAsV" + 
    "vIp4KcXle/v1RaXrLVnNBJ2H2DmrbUMOZbQUFXe698qmJsqNpLXRA367xpZ54i8kC5DTXwDhfxWTOZrB" + 
    "rh5sRKHcoVLumztIQjgWh37AzmSd1bLOfUGI0xjAL9zJWO3fRaeB0NS2KlmoKaVT5Y04zZEc06waU2r6" + 
    "AU2Dc4uipJqJmObqKM+tfNKAS0rZr5IudRiC7pUwnmtaHRe5fgSI8M7yvypvm+13Wm4Gwd4VnYiZvSxf" + 
    "8ImN3ZOG9wEzfyMIlH2+rKPUVHI+igsqla0Wd9m7ZUR9vFotj1uYV0OzG7hX0+huN2E/IdgLDjbiapj1" + 
    "e2fKHrMmGFaIvI6xzzJIQJF9GiRZ7+0jNFLKSyzX/K3JAyFrIPObfwM+y+zAgE1sWcZ1YnuBhICyRHBh" + 
    "aJDKIZL8MywrEfB2yF+R3k9wFG1oN48gSLyfrfEKuB/qgNp+BeTruWUk0AwRE9XVMUuRbjpxa4YA67SK" + 
    "unFEgFGgUfHBeHJTivvUl0u4Dki1UKAT973P+nXy2O0u239If/kRpNUVhMg8kpk7s8i6Arp7l/705/bL" + 
    "Cx4kN5hHHSXIqkiG9tHdeNV8VYo5+72hgaCx3/uVoVLmtvxbOIvo120uTJbuLVTvT8KtsOlb3DxwUrwL" + 
    "zaEMoAQAFk6Q9bNipHxfkRQER4kR7IYTMzSoW5mxh3H9O8Ge5BqVeYMEW36q9wnOYfxOLNw6yQMf8f9s" + 
    "JN4KhZty02xm707S7VEfJJ1KNq7b5pP/3RjE0IKtB2gE6vAPRvRLzEohu0m7q1aUp8wAvSiqjZy7FLaT" + 
    "tLEApXYvLvz6PEJdj4TegCZugj7c8bIOEqLXmloZ6EgVnjQ7/ttys7VFITB3mazzFiyQuKf4J6+b/a/Y";

    Hasp hasp = new Hasp(feature);
    HaspStatus status = hasp.Login(vendorCode);

    if (HaspStatus.StatusOk != status)
    {
        //handle error
        Application.Exit();
    }

Solution

As a workaround i made a separated dll with a private const string which contained the vendor api . I obfuscated the dll, so vendor key cannot be read .

Sample class dll obfuscated with Eazfuscator which is free at some version

public class VendorKey
{
    private const string salted = "AzIceaqfA1hX5wS+M8cGnYh5ceevUnOZIzJBbXFD6dgf3tBkb9cvUF/Tkd/iKu2fsg9wAysYKw7RMAsV" + 
"vIp4KcXle/v1RaXrLVnNBJ2H2DmrbUMOZbQUFXe698qmJsqNpLXRA367xpZ54i8kC5DTXwDhfxWTOZrB" + 
"rh5sRKHcoVLumztIQjgWh37AzmSd1bLOfUGI0xjAL9zJWO3fRaeB0NS2KlmoKaVT5Y04zZEc06waU2r6" + 
"AU2Dc4uipJqJmObqKM+tfNKAS0rZr5IudRiC7pUwnmtaHRe5fgSI8M7yvypvm+13Wm4Gwd4VnYiZvSxf" + 
"8ImN3ZOG9wEzfyMIlH2+rKPUVHI+igsqla0Wd9m7ZUR9vFotj1uYV0OzG7hX0+huN2E/IdgLDjbiapj1" + 
"e2fKHrMmGFaIvI6xzzJIQJF9GiRZ7+0jNFLKSyzX/K3JAyFrIPObfwM+y+zAgE1sWcZ1YnuBhICyRHBh" + 
"aJDKIZL8MywrEfB2yF+R3k9wFG1oN48gSLyfrfEKuB/qgNp+BeTruWUk0AwRE9XVMUuRbjpxa4YA67SK" + 
"unFEgFGgUfHBeHJTivvUl0u4Dki1UKAT973P+nXy2O0u239If/kRpNUVhMg8kpk7s8i6Arp7l/705/bL" + 
"Cx4kN5hHHSXIqkiG9tHdeNV8VYo5+72hgaCx3/uVoVLmtvxbOIvo120uTJbuLVTvT8KtsOlb3DxwUrwL" + 
"zaEMoAQAFk6Q9bNipHxfkRQER4kR7IYTMzSoW5mxh3H9O8Ge5BqVeYMEW36q9wnOYfxOLNw6yQMf8f9s" + 
"JN4KhZty02xm707S7VEfJJ1KNq7b5pP/3RjE0IKtB2gE6vAPRvRLzEohu0m7q1aUp8wAvSiqjZy7FLaT" + 
"tLEApXYvLvz6PEJdj4TegCZugj7c8bIOEqLXmloZ6EgVnjQ7/ttys7VFITB3mazzFiyQuKf4J6+b/a/Y";
    public static string Key
    {
        get
        {
            return salted
        }
    }
}