Index was out of range after deleting multiple rows from the datagridview? C#

Question

I use an ArrayList for my binary search. The datagridview's rows is added to the ArryList. When I deleting a single row from the datagridview, it works almost perfectly. The problem is when I delete many rows from the datagridview from the top or the bottom and middle, it gives me an error. How can I refresh or update the ArrayList after I deleted a row from the ArrayList (datagridview)?

The error:

'Index was out of range. Must be non-negative and less than the size of the collection. Parameter name: index'

---

My code for copying rows to the ArrayList:

I put this code into the button MouseEnter event, so before I click on button to search it copies everything to the ArrayList.

foreach (var row in dataGridView2.Rows.Cast<DataGridViewRow>())
{
   ArrayList[row.Index] = row.Cells[0].Value.ToString().Trim();
}

---

My delete code for the selected row(s):

foreach (DataGridViewRow item in this.dataGridView2.SelectedRows)
{
    dataGridView2.Rows.RemoveAt(item.Index);
    return;
}

My code for the binary search in winform:

int index = this.ArrayList.BinarySearch(textBoxBinarySearch.Text);
if (index > -1)
{
    dataGridView2.SelectionMode = DataGridViewSelectionMode.RowHeaderSelect;
    dataGridView2.Rows[index].Selected = true;
    dataGridView2.CurrentCell = dataGridView2.Rows[index].Cells[0];
    MessageBox.Show("Index is equal to: " + index, "Binary Search");
}

---

The error is occuring at:

dataGridView2.Rows[index].Selected = true;

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After opening a csv, the binary search is working perfectly!

Testing delete function.

Removed more rows from the datagridview.

After removed many rows from the datagridview, if I try to search for the name, the errors is appears.

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I hope I don't miss any information from my description. Thanks if you read it trough!

Answer 1

I use an ArrayList for my binary search. The datagridview's rows is added to the ArryList. When I deleting a single row from the datagridview, it works almost perfectly. The problem is when I delete many rows from the datagridview from the top or the bottom and middle, it gives me an error. How can I refresh or update the ArrayList after I deleted a row from the ArrayList (datagridview)?

Solution:

When I oppened two times the csv file, the binary search is worked well, but for the third time, it doesn't, because I had to clear my ArrayList with ArrayList.Clear(); not just the datagridview. Then I could copy the datagridview rows to the empty ArrayList.

dataGridView2.Rows.Clear();
ArryList.Clear();

Then ->

My code for copying rows to the ArrayList:

I put this code into the button MouseEnter event, so before I click on button to search it copies everything to the ArrayList.

foreach (var row in dataGridView2.Rows.Cast<DataGridViewRow>())
{
   ArrayList[row.Index] = row.Cells[0].Value.ToString().Trim();
}

---

My delete code for the selected row(s):

for (int i = dataGridView2.SelectedRows.Count - 1; i >= 0; i--)
{ 
      dataGridView2.Rows.RemoveAt(dataGridView2.SelectedRows[i].Index);
      ListOfPeople.RemoveAt(i);
}

---

My code for the binary search in winform:

int index = this.ArrayList.BinarySearch(textBoxBinarySearch.Text);
if (index > -1)
{
    dataGridView2.SelectionMode = DataGridViewSelectionMode.RowHeaderSelect;
    dataGridView2.Rows[index].Selected = true;
    dataGridView2.CurrentCell = dataGridView2.Rows[index].Cells[0];
    MessageBox.Show("Index is equal to: " + index, "Binary Search");
}

---

Thanks if you read it trough!