How to export 100 thousound records into csv file or rdlc using .NET

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Hi,
when I tried to export data upto 65000 records into rdlc it is working fine but if it exceeds 65000 records then i am getting out of memory exception
I need to export bulk data into rdlc or csv file using .net is there any alternate method is there to achieve this

Thanks

What I have tried:

I am able generate rdlc if the data is less
Below is the code I am using to generate rdlc

C#

using (SqlConnection con = new SqlConnection(sqlConnectionString))
                                {
                                    con.Open();
                                    SqlCommand cmd = new SqlCommand("select query from report_query where query_id=@id", con);
                                    cmd.Parameters.AddWithValue("@id", id);
                                    string query = cmd.ExecuteScalar().ToString();

                                    cmd.CommandText = query;
                                    cmd.CommandTimeout = 0;
                                    dt.TableName ="ReportTable";
                                    SqlDataAdapter da = new SqlDataAdapter(cmd);
                                    da.Fill(dt);
                                    con.Close();
                                }
                                
                                rvDataViewer.LocalReport.ReportPath = "Reports/ReportEX.rdlc";
                                rvDataViewer.LocalReport.DataSources.Clear();
                                rvDataViewer.LocalReport.DataSources.Add(new ReportDataSource("ReportEX", dt));
                                rvDataViewer.DataBind();
                                rvDataViewer.LocalReport.Refresh();

Posted 11-Dec-17 1:20am

Divyay208

Updated 11-Dec-17 3:19am

CHill60

v2

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________________ · Answer 1 · 2017-12-11T03:19:00

Comma separated file:

using (SqlConnection con = new SqlConnection(sqlConnectionString))
			{
				con.Open();
				SqlCommand cmd = new SqlCommand("select query from report_query where query_id=@id", con);
				cmd.Parameters.AddWithValue("@id", id);
				string query = cmd.ExecuteScalar().ToString();
				cmd.CommandText = query;
				cmd.CommandTimeout = 0;
								 
				SqlDataReader rReader = cmd.ExecuteReader();
				string reportName = string.Format("ReportEX_{0}.csv" , id);

				while(rReader.Read())
				{
					StringBuilder oneRow = new StringBuilder();
					for(int ii = 0; ii < rReader.FieldCount; ii++)
					{
						oneRow.AppendFormat("{0},", rReader[ii]);
					}
					oneRow.Append(Environment.NewLine);
					File.AppendAllText(reportName, oneRow.ToString());
				}
			}