Allow a max number of selections

Hi,
I'm quite new to Sharepoint but I've been trying to create a list and i want to allow people only to select a date for max 20 times, when that limit has been reached to give them back a message like "All slots are full, please select another date".
Is there a way i can do this?
Thanks

Hi,
You can achieve this using ItemAdding event receiver, where you can check the selected date from the user and get the count from the list for the selected and then throw the required message. Please refer to the following article.
https://msdn.microsoft.com/en-us/library/ff648923.aspx
https://social.technet.microsoft.com/Forums/sharepoint/en-US/e3d665b0-56da-4fe7-8dd6-1d1e29f70130/new-item-insertion-validation-through-event-handler
Please don't forget to mark it as answered, if your problem resolved or helpful.

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In my SQL query i have a scenario like, i have to pass the values to 'IN' Clause dynamically from other application. I want to know what is the the max number of values i can pass to 'IN' Clause.
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ADAPT00519195- Too many selected values (LOV0001) - Select Query Result operand
For XIR2 Fixed Details-Rejected as this is by design
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Test the issue by keep the value of MAX_Inlist_values parameter to 256 on designer level.
Workaround 2:
The best solution is to combine 'n' queries via a UNION. You should first highlight the first 99 or so entries from the LOV list box and then combine this query with a second one that selects the remaining LOV choices.
Using UNION between queries; which is the only possible workaround
Please do let me know if you have any queries related to the same.
Regards,
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Allow a max number of selections

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