how to fetch the .net runtime version from a client machine using wix bootstarper?

my requirement is to check the latest .net runtime version in client machine so that i can compare weather the particular version is belong to .net 6 runtimes or not ,i have tried some few steps to achieve my requirement

<util:RegistrySearch Id="DotNetVersionSearch" Variable="DOTNETVERSION"
					 Root="HKLM"
					 Key="SOFTWARE\Wow6432Node\dotnet\Setup\InstalledVersions\x64\sharedfx\Microsoft.WindowsDesktop.App"
					 Value="Version"
				     Result="value" />

the paricular variable I have declared on top of fragement <Property Id="DOTNETVERSION" Secure="yes" />

and I have define one custom action to verify weather the .net runtime version is belong to .net 6 or not like below .

 <CustomAction  Id="CheckDotNetVersion"
				BinaryKey="CustomActionBinary"
				DllEntry="CheckDotNetVersion"
				Execute="immediate"
				Return="check" />

and the action i have defined in a class named as Customaction.cs

    [CustomAction]
    public static ActionResult CheckDotNetVersion(Session session)
    {
        string dotNetVersion = session["DotNetVersion"];
        string dotNetVersionMin = session["DotNetVersionMin"];

        Version version;
        Version versionMin;

        if (!Version.TryParse(dotNetVersion, out version))
        {
            session.Log("Failed to parse DotNetVersion.");
            return ActionResult.Failure;
        }

        if (!Version.TryParse(dotNetVersionMin, out versionMin))
        {
            session.Log("Failed to parse DotNetVersionMin.");
            return ActionResult.Failure;
        }

        int result = version.CompareTo(versionMin);

        session["WIX_DOTNET_VERSION_COMPARE"] = result.ToString();

        return ActionResult.Success;
    }

and for displaying the error I have used the bal:Condition tag like below

<bal:Condition
        Message="This setup requires Microsoft .NET 6.0 or above."
        ><![CDATA[Installed OR (NOT Installed AND WIX_DOTNET_VERSION_COMPARE >= 0)]]>
    </bal:Condition>

but this is not working , can somebody help me on this to fix the issue

Wix has a built-in support for .NET version check, you can use that:

https://wixtoolset.org/docs/tools/wixext/dotnet/#net-and-net-core

Wix 3.x does not seem to support .NET 6 detection out of the box (but I am not completely sure), but Wix 4 does, so you may need to upgrade.

To figure out what is not working with your code, you can run your installer with a log file (msiexec yourfile.msi /l*v log.txt), and check the values of your variables passed around in the log after run.

Other than that, not quite sure why you are using <bal:Condition>, it is for "bal", the bootstrapper (a program that runs before your installation starts). Custom actions are executed during the installation, not in a bootstrapper. So, there is no chance for this condition to work, as far as I can see?