I can't add subitems to a ListView using more than one Button

Question

I am trying to make some note app for myself.
I can successfully get the course name, start date, end date and worked hours.
The problem is when I click the stop Button, I can't figure out how to add other data to same row but to the different columns.

private void button2_Click(object sender, EventArgs e) { ListViewItem item = new ListViewItem(); note.nameofcourse = textBox1.Text; item.Text = note.nameofcourse; listView1.Items.Add(item); DateTime date = DateTime.Now; note.dateofstart = date.ToString(); item.SubItems.Add(note.dateofstart); } private void button3_Click(object sender, EventArgs e) { DateTime time_2 = DateTime.Now; note.dateofend = time_2.ToString(); convertit(); } public void convertit() { DateTime dt = Convert.ToDateTime(note.dateofstart); DateTime d2 = Convert.ToDateTime(note.dateofend); TimeSpan totalsum = d2.Subtract(dt); note.totalsum = totalsum.ToString(); //item.SubItems.Add(note.totalsum); }

Also this is my class.cs:

class noteInfos { public string nameofcourse; public string dateofstart; public string dateofend; public string totalsum; }

ListView is much more awkward to work with than e.g. DataGridView; make a datatable with the relevant columns, bind it to the DGV (datasource property on the DGV) and then add rows to the table and they will appear in the grid — Caius Jard
– Caius Jard, Commented Sep 19, 2021 at 17:19
Also, please see - learn.microsoft.com/en-us/dotnet/csharp/fundamentals/… — Caius Jard
– Caius Jard, Commented Sep 19, 2021 at 18:05
Thank you for your informative answers. I am quite new to logic of OOP. Thats gonna help me for sure. — Orçun Onurkan Demirtürk
– Orçun Onurkan Demirtürk, Commented Sep 19, 2021 at 19:51

Orçun Onurkan Demirtürk · Accepted Answer · 2021-09-19 17:30:40Z

I fixed the problem somehow. First of all you should create the row if you dont even add something. Then you can edit these rows with that last piece of code.

private void button2_Click(object sender, EventArgs e) { ListViewItem item = new ListViewItem(); note.nameofcourse = textBox1.Text; item.Text = note.nameofcourse; listView1.Items.Add(item); DateTime date = DateTime.Now; note.dateofstart = date.ToString(); item.SubItems.Add(note.dateofstart); item.SubItems.Add(note.dateofend); item.SubItems.Add(note.totalsum); }

Then i add some weird things too.

 int sayi = listView1.Items.Count; listView1.Items[sayi -1].SubItems[2].Text = note.dateofend; listView1.Items[sayi -1].SubItems[3].Text = note.totalsum; note.totalsum = ""; note.dateofend = "";

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