Calling an SSIS package passing varibles from .Net Application

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VB

SQL-Server

SSIS

I have a question which i am trying to find a solution for how do we pass the parameters or Varibles to a package.dtsx dynamically using VB.net, i created a simple package with dateflow from one server to other. Source is accessing the data based on a sql command below is the sql command

SELECT     Ticker AS securityid, TradeTime, AvgPrice , Volume
FROM         table
WHERE     (Symbol = ?)
AND (Time >= ?)
AND (Time <= ?)

i created three varibles for symbol, start and end now i wanted to pass them from a .net application can some one give me some idea on how to do it or any links