How to find selected items count/length for multiselect control

Hi,
I used multi select control in my app,
there i need to get count/length of the selected items at client side to validate user weather any item selected or not
I knew how to do this in code behind pages. But i need this at client side.
Any solution is great help ful.

Hi,

Code:

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MultiSelect1.getValue()

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returns a string of selected values separated by comma.

Code:

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MultiSelect1.getIndexes()

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returns a string of selected values indexes separated by comma.