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validation group one elemetn disable

Posted By:      Posted Date: September 26, 2010    Points: 0   Category :ASP.Net

My scenario is,

I have a two radio button on the page and under that four dropdown and one text field.

I made a single validation group for all the field.

Now when selecting the second radio button then fourth dropdown will be invisible and a text field will be display on that positon.

I made all that using javascript.

Now the problem is when selecting the second radio button the fourth field is not visible.

But after selecting all the mandatory fields it again ask for the fourth dropdown. how can I made only that particular field out of that group when its not displaying?

I need all using javascript. 

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