problem in passing some parameters through url and let user select others

Migrateduser

<p>Hi,</p>
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<p>I would like to pass some hidden parameters though url and let the users select/input the required paramters. However the problem is that if I let the user enter the parameters, the other hidden parameters become null.</p>
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<p>If I pass all the parameters though url, it works fine. However, I would like to pass few hidden parameters though url and let the user select the other required paramters. Can someone please help me in getting this fixed</p>
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<p>Many Thanks</p>
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<p>Arif</p>