when i choose the particular item in dropdownlist to show the popup screen

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C#

Design as follows


To what extent was this course useful Dropdownlist (Excellent/Good/Poor)
To what extent you acquired skills Dropdownlist (Excellent/Good/Poor)
To what extent you gained confidence Dropdownlist (Excellent/Good/Poor)


From the above design when i choose the poor from the Dropdownlist i want to show the popup screen.

In that pop up screen in label Why should be there and one textbox to be available in that textbox type the reason for poor.

for that how can i do in asp.net using csharp.


Regards,
Narasiman P.