Question

I have a datable “myTable”, which is bind with a DataGridView “dgv”. The DataGridView “dgv” has a checkbox column. My goal is to delete rows checked in a button event. The datatable is updated of course.
Now my code is only working for deleting one row not for multiple rows.

Thanks for help.

 private void btnDel_Click(object sender, EventArgs e)
    {
        try
        {
            if (dgv.RowCount>0)
            {
                foreach (DataGridViewRow row in dgv.Rows)
                {
                    DataGridViewCheckBoxCell check = row.Cells[0] as DataGridViewCheckBoxCell;
                    if (check.Value != null)
                    {
                        if ((bool)check.Value)
                        {
                            DataRowView currentDataRowView = (DataRowView)dgv.CurrentRow.DataBoundItem;
                            DataRow dataRow = currentDataRowView.Row;

                            int n = dgv.CurrentRow.Index;
                            int intID = Convert.ToInt32(dgv.Rows[n].Cells[0].Value);
                            myTable.Rows.Remove(dataRow);
                            dgv.DataSource = myTable;

                            Int32 intVal = Convert.ToInt32(row.Cells[1].Value);
                            if (intVal == intID)
                            {
                                check.Value = null;
                            }
                        }
                    }
                }
            }
        }
        catch (Exception ex)
        {
            MessageBox.Show(ex.Message);
        }
    }

Answer 1

I found the solution. The error was caused by

 DataRowView currentDataRowView = (DataRowView)dgv.CurrentRow.DataBoundItem; 

currentDataRowView is not the checked row.
The correct code is:

                List<DataRow> toDelete = new List<DataRow>(); 
                for (int i = 0; i < dgv.Rows.Count; i++)
                {
                    {
                        DataGridViewRow row = dgv.Rows[i];
                        DataGridViewCheckBoxCell check = row.Cells[0] as DataGridViewCheckBoxCell;
                        if (check.Value != null && (bool)check.Value)
                        {
                            DataRow dataRow = (row.DataBoundItem as DataRowView).Row;
                            toDelete.Add(dataRow);
                        }
                    }
                }
                toDelete.ForEach(row => row.Delete()); 

Thanks everybody’s help.