Search using Paging example for SharePoint Online CSOM

SharePointSearchPagingCSOM

private static ResultTable GetSearchResults(int startIndex,ClientContext clientContext)
{
    ClientResult<ResultTableCollection> results = null;
    try
    {
        KeywordQuery keywordQuery = new KeywordQuery(clientContext);

        SearchExecutor searchExecutor = new SearchExecutor(clientContext);

        keywordQuery.StartRow = startIndex;//gets or sets the first row of information from the search results

        keywordQuery.QueryText = "queryText here";

        keywordQuery.RowLimit = 500;

        keywordQuery.RowsPerPage = 500;

        keywordQuery.TrimDuplicates = false;

        keywordQuery.Timeout = 10000; //10 minutes

        // execute the query and load the results into a collection
        results = searchExecutor.ExecuteQuery(keywordQuery);

        clientContext.ExecuteQuery();

        //clientContext.ExecuteQueryWithIncrementalRetry(5, 30000); //5 retries, with a base delay of 30 secs.

        return results.Value.FirstOrDefault(v => v.TableType.Equals(KnownTableTypes.RelevantResults));
    }
    catch (Exception)
    {
        throw;
    }
}

static void Main(string[] args)
{
    using (ClientContext clientContext = new ClientContext("https://sitecollectionurl"))
    {
        #region Build Data Dable
        DataTable resultDataTable = new DataTable();

        DataColumn titleCol = new DataColumn("Title");
        DataColumn pathCol = new DataColumn("Path");

        resultDataTable.Columns.Add(titleCol);
        resultDataTable.Columns.Add(pathCol);

        #endregion

        int currentRowIndex = 0;

        var resultTable = GetSearchResults(0, clientContext);

        if (resultTable != null && resultTable.TotalRowsIncludingDuplicates > 0)
        {
            while (resultTable.TotalRowsIncludingDuplicates > resultDataTable.Rows.Count)
            {
                foreach (var resultRow in resultTable.ResultRows)
                {
                    DataRow row = resultDataTable.NewRow();
                    row["Title"] = resultRow["Title"];
                    row["Path"] = resultRow["Path"];
                    resultDataTable.Rows.Add(row);
                }

                //Update the current row index
                currentRowIndex = resultDataTable.Rows.Count;

                resultTable = null;

                resultTable = GetSearchResults(currentRowIndex, clientContext);

                if (resultTable != null && resultTable.TotalRowsIncludingDuplicates > 0)
                {
                    if (resultTable.RowCount <= 0)
                    break;
                }
                else
                    break;
            }
        }

        string totalResults = resultDataTable.Rows.Count;
    }

}