Web Forms :: Validation To Select Only 4 Items In ListBox Using CustomValidator?

Jun 5, 2012

I have listbox where I am binding values from my database. Now my requirement is when user select values from listbox he/she can select only 4 values from listbox. If user select less than 4 or more than 4 values. I need to show validator that you can select only 4 values. How to achieve this?

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