Validation on Rad Grid filter

[chandan singh]

Hi team,
Need your help,
I want to apply validation on Rad Grid filter.
Example: If grid having four column like "Name","Age","City" and "Phone".
Now user want to search on grid with age it should take only numeric value( for example: 20,30,40 etc..).
 Filter don't except text field for example (Age: "Twenty","Fifty",etc..)
When user trying to give "Age" in text field then error message should be display.

Thanks
Chandan SIngh