ADO Repeated SQL Parameters - sql

Question

I have a query that uses a sub query with the same parameters, so it looks something like this:
strSelect = _
"SELECT a.State, a.FirstName, a.LastName, b.JobTitle " & _
"FROM apples a " & _
"LEFT JOIN ( " & _
"SELECT a.RecordNumber, " & _
"CASE WHEN j.JobTitle IS NULL THEN j.JobTitle2 ELSE j.jobtitle END " & _
"FROM apples a " & _
"LEFT JOIN jobs j ON j.RecordNumber = a.RecordNumber " & _
strWhere & _
") b ON b.RecordNumber = a.RecordNumber "
strWhere = _
"WHERE a.JobState = ? " & _
"AND a.JobDate = ? "
The sub-query in real life is less pointless than the one in the example.
The question here is if I repeat strWhere, then is there a way to get the parameters to work for the resulting strSQL = strSelect & strWhere statement? The issue is that I have two parameters, but they're repeated, so it would be four parameters for the strSQL statement, but I would prefer to not repeat my parameters when I declare them.
I have a feeling I'm missing something pretty obvious here. Any suggestions?

Answer 1

You should use named parameters:
Try using named parameters for example:
WHERE a.JobState = #JobDate
and
AND a.JobDate = #JobDate
Then, when you add your parameters you will only need to add them once. It will look something like this:
SqlParameter param = new SqlParameter();
param.ParameterName = "JobDate";
param.Value = theDate;