How to refresh the form

my first form is datagridview .side buttons is..add ,edit, delete,and close.now i want add some details then click add button then open another form...now insert the data from add form..now add form close after inserted data...i want automatic refresh the form1..

i am using form1 obj=new form1();
obj.refresh();

but it is not work..

Then i am using delegate ..then i got output...
we can use delegate and also event method.

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