How to control the order of selected items from DataGridView using check-boxes?

Question

Goal

Currently looking to find a way how to select items from DataGridView and order it by the selected first at top.

Example

First selection by user:

Selected  Column1 Column2
             a       1
             b       2
             c       3
   x         d       4

Second selection...

Selected  Column1 Column2
             a       1
   x         b       2
             c       3
   x         d       4

Third selection...

Selected  Column1 Column2
   x          a      1
   x          b      2
              c      3
   x          d      4

Order

4th row 
2nd row
1st row

Summary

The 1st item selected by user was the 4th row, then the 2nd and lastly the 1st row.

Question

How can I get a list of the all rows in order as explained above?

Current Code

I created a checkbox column like so, so the user can see what they have selected.

DataGridViewCheckBoxColumn checkBoxColumn = new DataGridViewCheckBoxColumn();
checkBoxColumn.Name = "Selected";
checkBoxColumn.HeaderText = "Selected";
checkBoxColumn.ReadOnly = false;
productsView.Columns.Add(checkBoxColumn);

User then checks the checkbox to mark the selected records they desire, then they click a button to which opens another form.

But the order is mixed.

private void addBtn_Click(object sender, EventArgs e)
{

    foreach (var row in checkedRows)
    {
        DateTime dateTime = dateText.Value;
        string orderNumber = orderNumberText.Text;
    
        SelectedProducts form = new SelectedProducts(dateTime, orderNumber);
        form.ShowDialog();
    }

}

Answer 1

I think i would:

1. Create a new list that would store my data depending on the new order.

   List<Item> SelectedItemList= new List<Item>
   

2. Listen to the checkbox column value change. Add to the "SelectedList" when checkbox is checked or remove it when unchecked.( How to detect DataGridView CheckBox event change?)

   private void dataGridView1_CellContentClick(object sender, DataGridViewCellEventArgs e)
   {
       dataGridView1.CommitEdit(DataGridViewDataErrorContexts.Commit);
   }
   
   private void dataGridView1_CellValueChanged(object sender, DataGridViewCellEventArgs e)
   {
       if (dataGridView1.Rows.Count > 0)
       {
           if ((bool)dataGridView1.SelectedRows[0].Cells[2].Value) //the index of checkbox column
              SelectedItemList.Add(itemBindingSource.current as Item)//add data to the list
           else
              SelectedItemList.Remove(itemBindingSource.current as Item) // remove data to list
       }
   
   }
   

3. Then use the list as parameter to the form display.

   SelectedProducts form = new SelectedProducts(SelectedItemList);
   form.ShowDialog();
   

Answer 2

You don't need to track the selection by each check-change. Just get the checked rows when you need them:

var checkedRows = dataGridView1.SelectedRows.Cast<DataGridViewRow>()
    .Where(r => (bool)r.Cells["Selected"].Value == true)
    .ToList();