Bootstrap Modal from Code

Could anyone tell me how to fire a modal popup (bootstrap) from vb code.

       <asp:Button ID="btnCancelApt" runat="server" Visible ="true" Text="Cancel" CssClass="btn btn-primary btn-xs" CommandName="Cancel" data-toggle="modal" data-target="#CancelApt" />

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Using Ajax modal  it would be   modalname.show()

I have tried

    Protected Sub btnCancelApt(sender As Object, e As EventArgs)
            ScriptManager.RegisterStartupScript(Me, [GetType](), "Show Modal Popup", "#CancelApt();", True)
        End Sub

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but it does not work..