showDialog() shows result without call

Question

I´ve got the following code-line to show a Window in a MessageBox:

MessageBox.Show(new ElbaKostenstellen(titel, loginid).ShowDialog().ToString());

The problem is, that when I close it, another MessageBox starts with true or false, but I never told it to do. How can I fix that?

Here´s more relevant code:

                    string ganzes = sr.ReadToEnd();
                    string[] allezeilen = ganzes.Split('\n');

                    for (int i = 0; i < allezeilen.Length - 1; i++)
                    {
                        string[] separated = allezeilen[i].Split(';');

                        String datum = separated[0];
                        String titel = separated[1];
                        if (titel.Contains('"'))
                        {
                            titel = titel.Replace('"', ' ');
                        }
                        String betrag = separated[3];
                        buchrep.bookFromElbaCSV(datum, titel, betrag, loginid);
                        //ElbaKostenstellen ek = new ElbaKostenstellen(titel, loginid);
                        //ek.Show();
                       MessageBox.Show(new ElbaKostenstellen(titel, loginid).ShowDialog().ToString());
                    }

Answer 1

In order to show a form calling ShowDialog on it is enough, a call to MessageBox.Show is unnecessary. Try;

new ElbaKostenstellen(titel, loginid).ShowDialog();

instead of

MessageBox.Show(new ElbaKostenstellen(titel, loginid).ShowDialog().ToString());