How to get data from object command reader

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ASP.NET

I selected an Item from dwopdownlist
I want to transfer its related data in to textboxes
I used the following code
How can I get the second field's data from the data record

What I have tried:

Protected Sub Button2_Click(ByVal sender As Object, ByVal e As System.EventArgs) Handles Button2.Click

Dim strConnString As String
strConnString = "Provider=Microsoft.Jet.OLEDB.4.0;Data Source=" & Server.MapPath("carrent.mdb") & ";Jet OLEDB:Database Password=;"
objConn = New OleDbConnection(strConnString)

Dim strSQL = "select * from ListOfCars where car_id=" & CInt(DropDownList1.SelectedValue) & " "

objConn.Open()

objCmd = New OleDbCommand(strSQL, objConn)
Dim myreader = objCmd.ExecuteReader()

Response.Write(DropDownList1.SelectedValue)
Response.Write(myreader.GetString(1)) 'here I get the error

End Sub