.net - "Maximum-Count of Selected Items"-Validator for ListBox -

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i have asked myself if there easy way check if listbox has maximum of 5 selected items. there must @ least 1 , @ 5 items selected.

do need customvalidator server-side validation?

many in advance...

you can customvalidator routine.

<asp:customvalidator id="listbox5itemsvalidator" runat="server"     onservervalidate="listbox5itemsvalidator_servervalidate"     clientvalidationfunction="listbox5itemsvalidator_clientvalidate"     controltovalidate="mylistbox"> </asp:customvalidator>

server-side code:

protected void listbox5itemsvalidator_servervalidate(         object source, servervalidateeventargs args) {      int selectioncount = 0;     foreach (listitem item in mylistbox.items) {         if (item.selected) selectioncount++;     }     args.isvalid = (selectioncount >= 1 && selectioncount <= 5); }

client-side code:

function listbox5itemsvalidator_clientvalidate(sender, args) {     var selectioncount = $('#<% =mylistbox.clientid %> option:selected').length;     args.isvalid = (selectioncount >= 1 && selectioncount <= 5); };

replace mylistbox actual name of listbox want validate. if listbox contained inside of other container controls, may need little more work reference control both on server , client side. instance, if contained in formview control called formview1, use

listbox mylistbox = (listbox)formview1.findcontrol("mylistbox");

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