C# DataGridView - Editing the Entire Columns

Question

I want to make an alarm system via dataGridView. I have 2 columns named "Name, Time". Those in the Time Columns should decrease by 1 per second. What do I need to do to edit them all at once?

Answer 1

you can use a DataTable and include it into the datagridview. Otherwise you can iterate through the rows and update everytime the "Time" column value. For both you have to run a timer. Tipp at this point: Let it run in different Threads: So you have one for the UI(-Interaction), one for other working parts and one for the timer, which calls every second the Updatefunction of the time column.

Answer 2

I extracted the list by transferring the times less than 30 seconds to the listbox using the for loop. As a temporary solution it works fine for now.

  DateTime d1;
        for (int i = 0; i < dataGridView1.RowCount - 1; i++)
        {
            d1 = Convert.ToDateTime(dataGridView1.Rows[i].Cells[1].Value);
           // MessageBox.Show(d1.ToString());
            if (d1 < dateTimePicker1.Value) // If less than 30 seconds send to listbox
                listBox1.Items.Add(d1);
        }
        ListCheck();