Optional query parameters in SQL Server -


i want fetch data sql server database using values dropdown list.

my query 

select  age,city,state,caste,incomemin,incomemax ruser (age between '" + drplistagemin.selecteditem + "' , '" + drplistagemax.selecteditem + "')  , (religion= '" + drplistreligion.selecteditem + "')  ");

what need understand how build query if value of religion dropdown optional rather compulsory?

in notation of @pratik:

select age,city,state,caste,incomemin,incomemax ruser age between @minage , @maxage , religion = coalesce(@religion, religion);

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