Giving validation to textboxes in repeater control for duplicate data

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.NET

C#3.5

Hi All,

I am working in Asp.NET web development,in my working website i had created one row where i have text boxes and Dropdownlist and when we select the numbers in Dropdownlist and click on select button dynamically in below repeater textbox creating with some dropdown controls,

so i wants to give validation in all of the textbox in single colomn as they should not repeated again once the user entered in the textbox of same colomn.

not a single textbox should match the another textbox,

Any Javascript or other types of validation in this if possible...

Thanks in Advance...