ok cerebrus and chuck 1 more thing came to my mind regarding checking of the querystring,whether it is null or not, the point is that as i am taking CngId, which means that its gona take only the integers,because on the basis of this cngId, i have to execute another functionality,now wat if a user enters 'a' or '#' in the url (as the querystring is visible in the url) because watever comes in the querystring, i am assigning it to cngId,ok i got tht how to chk whehter it is null or not,but how i overcome this problem.
suppose instead of writing this url "http://indexCNG.aspx?CngId=1"; a person enters this url,then an error came because of that,what to do in this regard "http://indexCNG.aspx?CngId=a";
