Question

I have a program that when it starts, opens a winform (it is the one specified in Application.Run(new …). From this form I open another form:

OtherForm newForm=new OtherForm(); newForm.Show(); 

How can i communicate from the new winform with the form that opened it? So that I can add some items in it.

Answer 1

I think I have found the answer here: http://www.c-sharpcorner.com/UploadFile/mosessaur/winformsdelegates09042006094826AM/winformsdelegates.aspx

I have to use delegates. In the second form I define:

public delegate void AddItemDelegate(string item); public AddItemDelegate AddItemCallback; 

And from the form that opened it I write:

private void btnScenario2_Click(object sender, EventArgs e) {      FrmDialog dlg = new FrmDialog();     //Subscribe this form for callback     dlg.AddItemCallback = new AddItemDelegate(this.AddItemCallbackFn);     dlg.ShowDialog();  } private void AddItemCallbackFn(string item) {      lstBx.Items.Add(item);  }