Accessing Data From Basic SQL Select * From TableName WHERE Search Params

I am learing VWD as I build a site and while I can use the various controls (GridView, FormView) to set up operations and retrieve/display database information, I need to be able to codebehind to do SQL operations for retrieving data to fill paper forms and to modify the database. After I retrieve data from the database, I need to do a lot of computation befor I build a paper quote that is emailed to a customer. I have written a subroutine to which I pass my sql query statement and I can add a new entry and edit an existing entry. The problem is a simple query to read an existing database entry.

If I write a simple command : Cmd = SELECT PartNumber, PartName, PartsAvailable FROM Inventory WHERE PartNumber = "P7226" , the command is executed but the return data falls on the floor somewhere as I dont know how to code to put the results in an array or in fact, have any idea on how to find the returned data. Can anyone help with this simple(?) problem?  My sub that handles the sql command is shown below.

I have also been looking for the way to code in VB to cause existing controls like GridViews to access, edit, and insert but I havent been able to find a paper or tutorial. If anyone has seen this information, it would be helpful also.Protected Sub CallSQL(ByVal Cmd As String)

Dim conn As New SqlConnection("Data Source=.SQLExpress;AttachDbFileName=C:Documents and SettingsaMy DocumentsVisual Studio 2005WebSitesWebSite5App_DataPINEMgt.mdf; Integrated Security=True;Connect Timeout=30;User Instance=True") 'Data Source=.SQLEXPRESS;AttachDbFilename="C:Documents and SettingsaMy DocumentsVisual Studio 2005WebSitesWebSite5App_DataPINEMgt.mdf";Integrated Security=True;Connect Timeout=30;User Instance=True)Dim sql As String = String.Empty

sql = Cmd

'Open the connection to the database and execute he SQL

conn.Open()Dim command As New SqlCommand(sql, conn)

command.ExecuteNonQuery()

conn.Close()

End Sub