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Credit go to @Lundin‭ for pointing me in the right direction.
Kvaser has a [CAN SDK](https://www.kvaser.com/developer/canlib-sdk/) free of charge. I added this to my VS22 C# project by adding
"...\Kvaser\Canlib\dotnet\x64\netstandard2.0\Kvaser.KvaDbLib.dll"
and
"...\Kvaser\Canlib\dotnet\x64\netstandard2.0\Kvaser.CanLib.dll" to my project references.

AND (this I was stuck on)

Copying "...\Kvaser\Canlib\bin_x64\kvaDbLib.dll" to your application folder (where you executable is).


I ported an .C example application to C# and it seems to work:

```
using kv = Kvaser.KvadbLib.Kvadblib;

List<string> VFrameFormat_enum_names = new() { "StandardCAN", "ExtendedCAN", "reserved", "J1939PG" };

void add_msg_to_db(kv.Hnd dbHnd, string msgName, int dlc, int msgID, out kv.MessageHnd msgHnd)
{
    kv.AddMsg(dbHnd, out msgHnd);
    kv.SetMsgName(msgHnd, msgName);
    kv.SetMsgDlc(msgHnd, dlc);
    kv.SetMsgIdEx(msgHnd, msgID);
    kv.SetMsgFlags(msgHnd, kv.MESSAGE.J1939);
}

void add_sig_to_msg
(
    kv.MessageHnd msgHnd, 
    string sigName, 
    string comment, 
    string unit, 
    kv.SignalEncoding encoding, 
    kv.SignalType type, 
    byte startBit, 
    byte length,
    double minVal,
    double maxVal,
    out kv.SignalHnd sigHnd
)
{
    kv.AddSignal(msgHnd, out sigHnd);
    kv.SetSignalName(sigHnd, sigName);
    kv.SetSignalComment(sigHnd, comment);
    kv.SetSignalUnit(sigHnd, unit);
    kv.SetSignalEncoding(sigHnd, kv.SignalEncoding.Intel);
    kv.SetSignalRepresentationType(sigHnd, type);
    kv.SetSignalValueSize(sigHnd, startBit, length);
    kv.SetSignalValueLimits(sigHnd, minVal, maxVal);
}

kv.Open(out kv.Hnd dbHnd);
kv.Create(dbHnd, "local", null);

kv.AddAttributeDefinition(dbHnd, out kv.AttributeDefHnd ProtocolType_attr);
kv.SetAttributeDefinitionType(ProtocolType_attr, kv.AttributeType.AttributeString);
kv.SetAttributeDefinitionName(ProtocolType_attr, "ProtocolType");
kv.SetAttributeDefinitionOwner(ProtocolType_attr, kv.AttributeOwner.AttributeOwnerDb);
kv.SetAttributeDefinitionString(ProtocolType_attr, "J1939");

kv.AddAttributeDefinition(dbHnd, out kv.AttributeDefHnd VFrameFormat_attr);
kv.SetAttributeDefinitionType(VFrameFormat_attr, kv.AttributeType.AttributeEnumeration);
kv.SetAttributeDefinitionName(VFrameFormat_attr, "VFrameFormat");
kv.SetAttributeDefinitionOwner(VFrameFormat_attr, kv.AttributeOwner.AttributeOwnerMessage);
for (int i = 0; i < 4; i++)
    kv.SetAttributeDefinitionString(VFrameFormat_attr, VFrameFormat_enum_names[i]);

add_msg_to_db(dbHnd, "TEST_MSG_000", 8, 0xC0FFEE, out kv.MessageHnd msgHand);
add_sig_to_msg(msgHand, "TEST_SIG_000", "I am a comment", "banana", kv.SignalEncoding.Intel, kv.SignalType.Unsigned, 0, 16, 0, 65535, out kv.SignalHnd sigHnd);

kv.WriteFile(dbHnd, "./testDBC.dbc");
```