Web Forms :: How To Restrict A User Not To Select More Then 4 Options In A ListBox
Aug 5, 2010
I am using a listbox
<asp:ListBox ID="ListBox1" runat="server" DataSourceID="_dsOccTypes" DataTextField="ListDisplay"
DataValueField="ListValue" Rows="6" SelectionMode="Multiple" Width="450"></asp:ListBox>
There are 10 options in the list box but I want the user only to select a maximum of 4. If user selects more then 4 then I want to display a message to user that they cannot select more then 4 options.
How can I achieve the above using some custom validator control?
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[URL]
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