Using SqlDataSource Programmaticaly!!

Hi All,
I have an SqlDataSource on my page which queries a MySql Db.
I am trying to use this for a login page but it only works for the first row of the Db.
I can kinda see where it's going wrong, by the password(0) bit becuase it is only looking at the first row, correct?

How can I get it to look at all the rows in the Db so anyone in the Db can login?

Thanks in Advance,
G

Protected Sub btnLogin1_Click(ByVal sender As Object, ByVal e As EventArgs)

        'Dim adapter As New OleDbDataAdapter(cmd, MyConn)
        Dim password As DataView
        Dim arg As New DataSourceSelectArguments
        password = SqlDataSource1.Select(arg)
               
        If password(0)("username1") = txtName.Text Then
            If password(0)("password1") = txtPass.Text Then
                Session("BlnLoggedIn") = True
                Response.Redirect("Default.aspx")
                If password(0)("admin1") = "1" Then
                Session("admin") = True
                Else
                Session("admin") = False
                End If
            End If
        End If
    End Sub