[RESOLVED] BAck button makes screen not match datasource

I'm a bit confused on how to fix this issue. I have a page that displays a list of vehicles in a gridview that is populate with a datatable from a database. I have a search feature that the user can do to limit the results. So basically they type in a truck number and click search, and it goes and loads the data table with just those records that match and loads the gridview with that table. Each row of the gridview has a Show button.

The problem happens if the user hits the back button on their browser. They are now looking at the unfiltered gridview, but the browser thinks it is filtered. If I click Show on the 10th row, the browser thinks the gridview only has 1 row and throws an index out of range error. Same thing happens if I try to look at the bound datatable.

Both of the below (commented and uncomment through me the index out of range error)

Protected Sub gvVehicles_RowCommand(ByVal sender As Object, ByVal e As System.Web.UI.WebControls.GridViewCommandEventArgs) Handles gvVehicles.RowCommand

Code:

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        If e.CommandName = "Show" Then
            Dim oInfo As New clsVehicleInformation
            Dim oSQL As New clsWPSMD
            Dim oVehicleSearch As New clsVehicleSearch

            'oInfo.strEquipmentID = DirectCast(gvVehicles.DataSource,  _
            '    Data.DataTable).Rows(Convert.ToInt32(e.CommandArgument) + _
            '    (gvVehicles.PageSize * gvVehicles.PageIndex)).Item(0)

            oInfo.strEquipmentID = gvVehicles.Rows(Convert.ToInt32(e.CommandArgument) + _
                (gvVehicles.PageSize * gvVehicles.PageIndex)).Cells(0).Text

            oSQL.LoadVehicleInfo(oInfo)

            PopulateVehicleInfo(oInfo)
        End If
    End Sub

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Blah, me being stupid again and not having a not ispostback in my page_load, so nevermind...