c# - Add a datagridview column from another form -

i have 2 forms , datagridview in form1.im trying add new column clicking in button form2.like that:

 form2       private void button1_click(object sender, eventargs e)     {         form1 form1 = new form1();          form1.datagridview1.columns.add("test" , "test");      } 

how can that?

form1 form1 = new form1(); 

this not work real form1 there, pressume. instead create reference in form2 , load in form2's constructor!

here steps:

1. the local reference form1 in form2's variables: form1 form1

2. when opening form2 pass reference form1 in constructor:

   form2 = new form2(this);

3. store in local refence in constructor on form2:

   public form2(form1 form1_) {     initializecomponent();     form1 = form1_; } 

now set use form1 , public properties , controls. use form1.datagridview1 must make public first, though. (or create public reference it..)