How to delete specific rows in a datagridview?

Question

I have a datagridview on a windows form and I want to be able to delete all rows that have a negative or zero value within a specific column (when user presses button), but I don't know the best way to approach this.

dataGridView2 example:
1 48.54      Col 3 Ref
2 78.14      Col 3 Ref
3 -148.52   Col 3 Ref
4 486.45     Col 3 Ref

Could someone provide assistance on the best way to do this?

private void button1_Click(object sender, EventArgs e)
        {
           for (int i = 0; i < dataGridView2.Rows.Count; i++)
           {
                 if (double.Parse(dataGridView2.Rows[i].Cells[1].Value.ToString()) < 0)
                 {
                       //What do I need to delete row?
                       i = i -1;
                  }
            }
         }

Alan · Answer

You need to iterate through the Rows collection backwards (so as not to interfere with the indices still to be examined) and then use the RemoveAt() method: private void button1_Click(object sender EventArgs e) { for (int i = dataGridView2.Rows.Count - 1; i >=0 ; i--) { if (dataGridView2.Rows[i] == null) continue; if (double.Parse(dataGridView2.Rows[i].Cells[1].Value.ToString()) { dataGridView.Rows.RemoveAt(i); } } }