I am trying to concatenate variable in helmchart to develop connection strings.

connection string:

ConnectionStrings:TheSourceContext="Server=10.xx.xx.xx,1433;Database=Test;User Id=Test; Password=pass123;"

I am passing user id &password as secret but it is not working. it is not building up the requried strings.

      - name: DBUSERD
        valueFrom:
          secretKeyRef:
            key: dbuser
            name: api-catalogue
      - name: DBPASSD
        valueFrom:
          secretKeyRef:
            key: dbpass
            name: api-catalogue
      - name: ConnectionStrings__TheSourceContext
        value: {{ .Values.const.DBSVR }}{{ .Values.app.connectionStringsServer }},{{.Values.app.connectionStringsPort }}{{ .Values.const.DB }}{{ .Values.app.connectionStringsDB }}{{ .Values.const.DBUSR }}$(DBUSERD){{ .Values.const.DBPASS }}($DBPASSD)*

How to correct above variable so that it will work?