Report Parameter validation in ssrs report

Question

I have created one SSRS report having begin date and end date. If I provide end date< start date it will execute the report as shown in the image

Answer 1

Ciarán, thanks for your suggestion, but the problem with it is you are still hitting the database. I came across these two links that I found a little more helpful in explaining how to validate in SSRS without hitting the database.

This link shows everything except it's not clear how to use the validation parameter in conjunction with the stored proc.: http://geekswithblogs.net/Compudicted/archive/2012/08/14/validate-ssrs-report-input-parameters-the-proper-way.aspx

This link clears up how to use the validation parameter with the stored proc.: https://social.msdn.microsoft.com/Forums/sqlserver/en-US/01b37f60-9048-4c54-8d54-574b5fc71de5/how-to-call-a-stored-proc-conditionally-based-on-a-parameter-validation-or-using-a-stored-proc-in?forum=sqlreportingservices

Added helpful link... I needed to validate using regular expressions and found this link really helpful: https://regex101.com/