Winform中DataGridView多行删除

//在DataGridView中删除选中行，从数据库中删除。
private void ButtonDelete_Click(object sender, EventArgs e)
{
    if (dataGridView1.DataSource == null || dataGridView1.CurrentRow == null)
    {
        return;
    }
    else
    {
        if (this.dataGridView1.SelectedRows.Count > 0)
        {
            DialogResult dr = MessageBox.Show("确定删除选中的记录? ", "提示", MessageBoxButtons.OKCancel, MessageBoxIcon.Question);
            if (dr == DialogResult.OK)
            {
                try
                {
                    dbcon.Open(); //打開連接
                    string sql = "";
                    OracleCommand cmd = dbcon.CreateCommand();
                    //遍历所选中的dataGridView记录行
                    foreach (DataGridViewRow row in this.dataGridView1.SelectedRows)
                    {
                        //取dataGridView1中的第三列的值
                        string strName = row.Cells[2].Value.ToString();
                        sql = "delete from company where name=‘" + strName + "‘";
                        cmd.CommandType = System.Data.CommandType.Text;
                        cmd.CommandText = sql;
                        cmd.ExecuteNonQuery(); //执行删除
                    }
                    cmd.Dispose();
                }
                catch (Exception ex)
                {
                    MessageBox.Show(ex.ToString(), "提示");
                }
                finally
                {
                    dbcon.Close(); //關閉連接
                    dbcon = null; //釋放資源
                }
                //删除后执行刷新操作
                this.ButtonFresh_Click(null, null); 
            }
            else
            {
                return;
            }
        }
    }
}