how to delete record in datagrid view when checkbox is checked

I have a datagridview with a checkbox column, and I want to delete the row that is checked by a delete button. However, some other rows which is unchecked was deleted instead of the checked row. I got an list object(srv_NameList) to store the value of each row which are used to delete the record, any value that store in that list will be delete once the button is clicked :

private void dataGrid_CellValueChanged(object sender, DataGridViewCellEventArgs e) {

        if (dataGrid.Columns[e.ColumnIndex].Name.Equals("Select"))
        { 
            if (dataGrid.Rows[e.RowIndex].Selected == true)
                {

                    string srvName = dataGrid.Rows[e.RowIndex].Cells["ServiceName"].Value.ToString();

                    srv_NameList.Add(srvName);

                }
            if (dataGrid.Rows[e.RowIndex].Selected == false)
            {
                string srvName_del = dataGrid.Rows[e.RowIndex].Cells["ServiceName"].Value.ToString();

                if (srv_NameList.Contains(srvName_del))
                {
                    srv_NameList.Remove(srvName_del);
                }



            }
            }
    }

Can someone kindly tell me what's wrong here?