How to show a message when user directly click the link without selecting dropdownlist

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In my master page i have three dropdownlists(State,District,Area) and some links(Schools,Hospitals,Busstands).And i have inserted the details of schools,hospitals....by giving Area id as foreign key .Now when i select state district and area it displaying the details of schools hospitals of that selected area.Now the question is, when i click link(Schools,Hospitals,Busstands) directly( not selecting dropdownlist) it showing error (Incorrect syntax near '=' , da.Fill(ds);),i wants to show a message as PLEASE SELECT YOUR AREA

Posted 20-Dec-14 20:16pm

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DamithSL 21-Dec-14 5:29am

update the question with your code

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DamithSL · Answer 1 · 2014-12-20T20:32:00

you can use requiredfieldvalidator and set the initial value as default value of the area drop down
check the sample codes given in the documentation RequiredFieldValidator.InitialValue[^]
by using requiredfieldvalidator you can check inputs without going to server side validation.
if you want to do the same in server side c# code; check the value of area code before you fetch the data from the database. if it is empty you can show message and exit the data loading method without executing database select statement