how to save exception in txt file?

Question

public DataTable InsertItemDetails(FeedRetailPL objFeedRetPL)
{
    DataTable GetListID = new DataTable();
    try
    {
        SqlParameter[] arParams = new SqlParamet         


        

Answer 1

string[] path1 = Directory.GetFiles(@"E:\storage", "*.txt");//it get the all textfiles from the folder

                for (var i = 0; i < path1.Length; i++)
                {
                var file = Directory.GetDirectories(networkPath);

                

                    var path = file;
                string temp_FilePath = "E:\\temp.txt";
                string temp_FilePath1 = @"E:\ExceptionFiles\Cs_regular\\Cs_regular.txt";
                string temp_FilePath2 = @"E:\ExceptionFiles\CC_eBilling\\CC_eBilling.txt";
                string folder = @"E:\ExceptionFiles\Cs_regular";
                string folder1 = @"E:\ExceptionFiles\CC_eBilling";



                string[] lines;
                var list = new List();
                var list1 = new List();
                var list2 = new List();
                var error = false;
                var fileStream = new FileStream(path, FileMode.Open, FileAccess.Read);
                var fileStream1 = new FileStream(path, FileMode.Open, FileAccess.Read);
                var fileStream2 = new FileStream(path, FileMode.Open, FileAccess.Read);




                using (var streamReader = new StreamReader(fileStream, Encoding.UTF8))
                {
                    string line;



                    while ((line = streamReader.ReadLine()) != null)
                    {


                        var res = line.Substring(20, 16);
                        //var timenow = DateTime.Now.ToString("yyyy /MM/dd HH:mm");
                        var timenow1 = "2020/10/31 10:11";

                        if (res == timenow1)
                        {

                            string linesRemoved = "ERROR";

                            if (!line.Contains(linesRemoved))
                            {

                                if (error == true)
                                {
                                    if (line.Contains("at"))
                                    {
                                        list1.Add(line);
                                        error = true;
                                    }
                                    else
                                    {
                                        error = false;
                                    }
                                }

                            }
                            else
                            {
                                error = false;
                            }




                            if (line.Contains("Exception1") && error == false)
                            {
                                list1.Add(line);
                                error = true;
                            }

                        }



                    }
                }

                

                using (var streamReader2 = new StreamReader(fileStream2, Encoding.UTF8))
                {
                    string line;
                    while ((line = streamReader2.ReadLine()) != null)
                    {
                        string linesRemoved = "ERROR";
                        var res = line.Substring(20, 16);
                        //var timenow = DateTime.Now.ToString("yyyy/MM/dd HH:mm");
                        var timenow1 = "2020/10/29 12:38";
                        if (res == timenow1)
                        {

                            if (!line.Contains(linesRemoved))
                            {
                                if (error == true)
                                {
                                    if (line.Contains("at"))
                                    {

                                        list2.Add(line);
                                        error = true;
                                    }
                                    else
                                    {
                                        error = false;
                                    }
                                }
                            }
                            else
                            {
                                error = false;
                            }



                            if ((line.Contains("Exception2") && line.Contains("Exception:")) && error == false)
                            {
                                list2.Add(line);
                                error = true;

                            }
                        }






                    }
                }




                if ((System.IO.File.Exists(temp_FilePath1) || System.IO.File.Exists(temp_FilePath2)))
                {

                    int fileCount = Directory.GetFiles(folder).Length;
                    int fileCount1 = Directory.GetFiles(folder1).Length;
                    fileCount++;
                    fileCount1++;
                    temp_FilePath1 = temp_FilePath1 + "(" + fileCount.ToString() + ").txt";
                    temp_FilePath2 = temp_FilePath2 + "(" + fileCount1.ToString() + ").txt";


                }
                {
                    System.IO.File.WriteAllLines(temp_FilePath1, list1);
                    System.IO.File.WriteAllLines(temp_FilePath2, list2);

                }





                System.IO.File.WriteAllLines(temp_FilePath, list);

                System.IO.File.WriteAllLines(temp_FilePath1, list1);
                System.IO.File.WriteAllLines(temp_FilePath2, list2);

                }

            }
        }
        catch (Exception ex)
        {

        }



        return null;