in textcolumn of datagridview ,if user have an error input,which event will be activated

hi

   may i ask a question.

    in textcolumn of datagridview ,if user have an error input,which event will be activated

   for example, when user inout a tring in a textcolumn whose datasource is a field of int,then a message box of error will be shown .but i 'd like to know which event is activated since i'd like to add some more control

   thank u very much in advance

best regards