How to Upload and Split XML Files in C#

if (Page.IsValid)
{
   // string fileName = fileupld.PostedFile.FileName;
   bool m_UpdateFlag;
   // int m_TotRec, m_AcceptRec, m_rejRec;
   m_UpdateFlag = false;
   if (fileupld.PostedFile.FileName == "" || fileupld.PostedFile.FileName == null)
   {
      ScriptManager.RegisterStartupScript(this.Page, this.GetType(), "Information", "alert('Please Select the XML file ');", true);
      fileupld.Focus();
      return;
   }
   if (File.Exists(Server.MapPath("~/source/") + System.IO.Path.GetFileName(fileupld.FileName)))
   //if (File.Exists(Server.MapPath(ConfigurationManager.AppSettings["source"].ToString() + fileupld.PostedFile.FileName)))
   {
      fileupld.SaveAs(Server.MapPath("~/ErrorLog/") + System.IO.Path.GetFileName(fileupld.FileName));
      // PanelError.Visible = true;
      lblMsg.Text = "This File <b>" + fileupld.PostedFile.FileName + "</b> already exists on the server.";
      return;
   }
   if (File.Exists(Server.MapPath("~/source/") + System.IO.Path.GetFileName(fileupld.FileName)))
   {
      File.Delete(Server.MapPath("~/source/") + System.IO.Path.GetFileName(fileupld.FileName));
   }
   fileupld.SaveAs(Server.MapPath("~/source/") + System.IO.Path.GetFileName(fileupld.FileName));
   string FileName = fileupld.FileName.ToString();
   FileName = FileName.Substring(0, 3); // FileType
   strACKFile = Path.GetFullPath(Server.MapPath("~/source/") + System.IO.Path.GetFileName(fileupld.FileName));
   if (strACKFile.Trim().Length == 0)
   {
      ScriptManager.RegisterStartupScript(this.Page, this.GetType(), "Warning", "alert('Please Select The XML File');", true);
      fileupld.Focus();
      return;
   }
   string xmlFilePath = Server.MapPath("~/source/") + System.IO.Path.GetFileName(fileupld.FileName);
   string source1 = System.IO.File.ReadAllText(xmlFilePath);
   string source = source1.Replace("\r\n", " ");
   //string source2 = source.Replace("\"INR\"", "'INR'");
   List<string> destList = new List<string>();
   foreach (Match match in Regex.Matches(source, "<GrpHdr>(.*?)</GrpHdr>"))
   destList.Add(match.Groups[1].Value);
   string GroupHeader = destList[0];
   GroupHeader = GroupHeader.Replace("\t", "");
   GroupHeader = "<GrpHdr>" + GroupHeader + "</GrpHdr>"; //GroupHeader
   List<string> AmtList = new List<string>();
   string amt = GroupHeader.Replace('"', ' ');
   foreach (Match match in Regex.Matches(amt, "<TtlIntrBkSttlmAmt Ccy= INR >(.*?)</TtlIntrBkSttlmAmt>"))
   AmtList.Add(match.Groups[1].Value);
   string amtResult = AmtList[0]; //Amount
   List<string> NoOfTxsList = new List<string>();
   string TxsCount = GroupHeader.Replace('"', ' ');
   foreach (Match match in Regex.Matches(amt, "<NbOfTxs>(.*?)</NbOfTxs>"))
   NoOfTxsList.Add(match.Groups[1].Value);
   string TxsCountResult = NoOfTxsList[0]; //txnNo
   // string grph = GroupHeader.Replace("'INR'", "INR");
   String strQ = "insert into EBT_master(TYPE,GroupOFHeader,Amount,TXN_NO)values('" + FileName + "','" + GroupHeader + "','" + amtResult + "','" + TxsCountResult + "')";
DbObj.gl_ExeNonQuery(strQ);