如何在按钮单击事件中更改另一个表单名称

Question

I am working on windows form application ...
I have two forms .. 1->frm master 2->frm shifting

i have a OK button in frm shifting..while i cliking the button i want o change the name of frmmaster

frmmaster is the my parent form

so i given code in Ok button event like thise

frmmaster.Text="NewName"

but this is not working.. while coming to this line am getting error: Object reference not set to an instance of an object.

Answer 1

put this on your child form's click event:

Form form = Application.OpenForms["frmmaster"];
form.Text="lol";

Answer 2

Try this:

((your frmName)this.MdiParent).Text = "SomeText":

like

((frmMaster)this.MdiParent).Text = "SomeText"

or

Make sure when you create your child form you assign an MDI parent to it.

//Open form in frmMaster
frmShifter.MdiParent = this;