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how to Check any 2 checkBox from 4 CheckBoxes?

Anonymous User 2272 05-Sep-2014

I want the user can check only 2 checkbox,exceeding that alert box should pop up.

 <body>
        <form id="form1" runat="server">
        <div>
            <table width="100%">
                <tr>
                    <td>
                    <asp:CheckBox id="q3a" runat="server" Text="Public" />
                    </td>
                    <td>
                    <asp:CheckBox id="q3b" runat="server" Text="void" />
                    </td>
                    <td>
                    <asp:CheckBox id="q3c" runat="server" Text="protected"/>
                    </td>
                    <td>
                    <asp:CheckBox id="q3d" runat="server" Text="return" />
                    </td>
                </tr>
            </table>
            <asp:Button ID="btnSubmit" Text="submit" runat="server"/>
        </div>
        </form>
    </body>

how can i write javascript for this, i have tried but can't find any way out.


Updated on 05-Sep-2014
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