hello everyone
my query is : i have to write trigger on student object which has one custom checkbox if user check that checkbox then automatically deselect all in record and if user update that true to false than print error message that at least you have to select one check box....please help thanxs in advance

Hi team,
My name is balaji. I am new to salesforce development. I have one doubt.

why we having custom controllers, we can also achieve the things by using standard controller with extension controller.

Thanks in advance.
 

hello everyone
my query is : i have to write trigger on student object which has one custom checkbox if user check that checkbox then automatically deselect all in record and if user update that true to false than print error message that at least you have to select one check box....please help thanxs in advance