amigos disculpen la tardansa, aqui le codigo que estoy utilizando, pero sin variable de sessio,
Cita: OleDbConnection conne = new OleDbConnection("Provider=Microsoft.ACE.OLEDB.12.0 ;Data Source=|DataDirectory|baconwp.accdb");
conne.Open();
OleDbCommand cmd = new OleDbCommand("select usuario, password from tlausers where usuario=@username and password=@password", conne);
cmd.Parameters.AddWithValue("@usuario", txtu.Text);
cmd.Parameters.AddWithValue("@password", txtp.Text);
OleDbDataAdapter da = new OleDbDataAdapter(cmd);
DataTable tb = new DataTable();
da.Fill(tb);
if (tb.Rows.Count > 0)
{
Response.Redirect("Default.aspx");
}
else
{
ClientScript.RegisterStartupScript(Page.GetType(), "validation", "<script language='javascript'>alert('usuario y contraseña incorrectos')</script>");
}