Delete Multiple rows from datagridview

Question

I\'ve a datagridview in which values are inserted.The gridview is like this.

    Item                PRID                 
   ------              ------              


        

Answer 1

The are a couple of ways around this. One is to do the following

for (int i = dataGridView1.RowCount - 1; i >= 0; i--)
    if (String.Compare(dataGridView1.Rows[i].Cells[1].Value.ToString(), "2") == 0)
        dataGridView1.Rows.Remove(dataGridView1.Rows[i]);

This is looping from the bottom end of the DataGridView and avoids the problem with removing rows whilst iterating.

I hope this helps.

Answer 2

As mellamokb pointed out the reason is because your editing the collection during the foreach. One solution would be to store the rows with the same PRID in a list first and then remove them after. Something like this

var rowsToRemove = new List<int>();

foreach (DataGridViewRow dgv_r in PurchaseOrder_dgv.Rows)
{
    if (dgv_r.Cells[1].Value.ToString() == CurrentSelected_PRID_ForPurchaseOrder.ToString())
    {
        rowsToRemove.Add(dgv_r.Index);
    }
}

rowsToRemove.Reverse();
rowsToRemove.ForEach(i => PurchaseOrder_dgv.Rows.RemoveAt(i));

Another solution is to use a while loop instead which takes into account the possiblity of the collection size changing.

int i = 0;
while (i < PurchaseOrder_dgv.Rows.Count)
{
    if (PurchaseOrder_dgv.Rows[i].Cells[1].Value.ToString() == CurrentSelected_PRID_ForPurchaseOrder.ToString())
    {
        PurchaseOrder_dgv.Rows.RemoveAt(i);
    }
    i++;
}