SQL Server: Create an ID field (PK) based on two fields with a trigger-- HELP!

[newDevMan]

Ok, So I'm a bit new at SQL Server, and I've researched this everywhere but cannot find a clear answer and/or sample code for a solution:

-I have a table [Indicators] that has a bunch of fields including [MOE] field and a [Indicator_Selector] field, and the [INDid] field, which is the PK.

-My goal is to auto-generate the [INDid] field (PK) from concatenating the [MOE] and [Indicator_Selector] fields. so... [INDid]=[MOE]+[Indicator_Selector].

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My first option was to make the [INDid] field a calculated field, which worked, and it even let me set it as a PK... BUT, SQL server does NOT allow this field to be a FK on a different table, which is crucial for my database. SO... I am told that a TRIGGER can do the trick, and I have found some samples on the internet, but none of them work correctly and are poorly explained.

Can anyone help me please? Thanks in advanced!!!

[Rabbit]

There's no need to create a third field to combine two other fields to use as a PK. You can set both fields as the PK and make it into a composite key.

[newDevMan]

Thanks rabit, and though it is possible, that is NOT an option. I NEED to have the [INDid] field, it is a foreign key for another table that joins with this one. Still need a trigger... Help!

[Rabbit]

You can set the foreign key on the composite.

[newDevMan]

I need a trigger that generates the field.

[Rabbit]

If you create a composite foreign key, you don't need a trigger to populate a third field. It would be simpler and the data would be more normalized.