<a href="#Modal" role="button" class="btn btn-success" data-toggle="modal" title="Tıkla">Tıkla</a><br />

    <div id="Modal" class="modal hide fade" style="width: 915px; left: 37%; max-width: 100%">
        <div class="modal-header">
            <button type="button" class="close" data-dismiss="modal" aria-hidden="true">&times;</button>
            <h3>Model</h3>
        </div>
        <div class="modal-body">
            <asp:DropDownList ID="ddl" runat="server">
            </asp:DropDownList>
        </div>
        <div class="modal-footer">
            <button class="btn" data-dismiss="modal" aria-hidden="true">Kapat</button>
            <asp:Button ID="Button1" runat="server" Text="Kaydet" CssClass="btn btn-primary" OnClick="KulTasi_Click" />
        </div>
    </div>