SQL Datasource Select Command

I have a select command which has 2 parameters

select * from Products where id like @Customer and inStock = @inStock

So what I am doing is putting parameters using the Selecting Event. The problem I am having is that the parameters don't seem to be taking effect.

Any ideas as to what might be wrong? This works fine when doing an insert, and was hoping to use this for the a select so I could automatically filter the Gridview, without ruiing my Update, Insert, Cancel that I have going on with the gridview.

Private selectParameters As New List(Of SqlParameter)()
 
Protected Sub SqlDataSource1_Selecting(ByVal sender As Object, ByVal e As SqlDataSourceSelectingEventArgs)
 
 
        Dim spCustomer As New SqlParameter("@Customer", SqlDbType.VarChar, 255)
        spCustomer.Direction = ParameterDirection.Input
 
        If Not ddlCustomers.SelectedValue.Equals("-1") Then
            'gridviewSelect = gridviewSelect + " and ProductWholesaler ='" + ddlCustomers.SelectedValue + "'"
            spCustomer.Value = ddlCustomers.SelectedValue
            selectParameters.Add(spCustomer)
        Else
            spCustomer.Value = "%"
            selectParameters.Add(spCustomer)
        End If
 
        Dim spStock As New SqlParameter("@Stock", SqlDbType.VarChar, 255)
        spStock.Direction = ParameterDirection.Input
        If Not ddlStock.SelectedValue.Equals("-1") Then
            'gridviewSelect = gridviewSelect + " and ProductStock ='" + ddlStock.SelectedValue + "'"
            spStock.Value = ddlStock.SelectedValue
            selectParameters.Add(spStock)
        Else
            spStock.Value = "%"
            selectParameters.Add(spStock)
        End If
 
     
        For Each p As SqlParameter In selectParameters
            e.Command.Parameters.Add(p)
        Next
 
    End Sub
    Protected Sub SqlDataSource1_Selected(ByVal sender As Object, ByVal e As SqlDataSourceStatusEventArgs)
        selectParameters.Clear()
    End Sub

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