public void dgvExportToCsv(DataGridView dgvValue,
                                        string csvFullFilename,
                                        string delimiter = ",",
                                        List<int> omitRowIdxList = null,
                                        List<int> omitColumnIdxList = null,
                                        List<int> useTagColumnIdxList = null)
    {
        StreamWriter csvStreamWriter = new StreamWriter(csvFullFilename, false, System.Text.Encoding.UTF8);

        int rowIdx = 0, realRowIdx = 0;
        int columnIdx = 0, realColumnIdx = 0;

        //output header data
        string headerRowStr = "";
        for (columnIdx = 0, realColumnIdx = 0; columnIdx <= dgvValue.ColumnCount - 1; columnIdx++)
        {
            if ((omitColumnIdxList != null) && omitColumnIdxList.Contains(columnIdx))
            {
                //omit this column
            }
            else
            {
                headerRowStr += dgvValue.Columns[columnIdx].HeaderText + delimiter;

                realColumnIdx++;
            }
        }
        csvStreamWriter.WriteLine(headerRowStr);

        //output rows data
        for (rowIdx = 0, realRowIdx = 0; rowIdx <= dgvValue.RowCount - 1; rowIdx++)
        {
            if ((omitRowIdxList != null) && omitRowIdxList.Contains(rowIdx))
            {
                //omit this row
            }
            else
            {
                string eachRowStr = "";
                for (columnIdx = 0, realColumnIdx = 0; columnIdx <= dgvValue.ColumnCount - 1; columnIdx++)
                {
                    if ((omitColumnIdxList != null) && omitColumnIdxList.Contains(columnIdx))
                    {
                        //omit this column
                    }
                    else
                    {
                        DataGridViewCell curCell = dgvValue[columnIdx, rowIdx];//dgvValue.Rows[rowIdx].Cells[columnIdx]
                        if ((useTagColumnIdxList != null) && useTagColumnIdxList.Contains(columnIdx))
                        {
                            eachRowStr += curCell.Tag + delimiter;
                        }
                        else
                        {
                            eachRowStr += curCell.Value + delimiter;
                        }
                        
                        realColumnIdx++;
                    }
                }
                csvStreamWriter.WriteLine(eachRowStr);

                realRowIdx++;
            }
        }

        csvStreamWriter.Close();        
    }

    

            string outputFilename = txbExpAlertFilename.Text + ".csv";
            string fullFilename = Path.Combine(saveFolderPath, outputFilename);

            List<int> omitColumnIdxList = new List<int>();
            //omit the last column: View page
            omitColumnIdxList.Add(dgvSearchedAlerts.ColumnCount - 1);

            crifanLib.dgvExportToCsv(dgvSearchedAlerts, fullFilename, omitColumnIdxList: omitColumnIdxList);