insert repeating data in table of word document using open xml 2.0

[gogi100]

i have sharepoint list where user populate some fields. i made event receiver that when user update some fields in document library is created document where inserting repeating data in table. i have problem. my code is

`public bool CreateDocument(string sFilename, string sContentType, string sList, string id, string broj, string datum, string opis, string ponudjac, string ponudjacadresa, string ponudjacemail, string sektor, string sektormestorada, string subjektrevizije, string usluge, string akontacija, string udaljenostodsubjekta, string rukovodilac, string url)
{
try
{
SPSite site = new SPSite(url);
using (SPWeb web = site.OpenWeb())
{

                SPList list = web.Lists[sList];
                // this always uses root folder
                SPFolder folder = list.RootFolder;
                SPFileCollection fcol = folder.Files;
                   
                // find the template url and open
                string sTemplate = list.ContentTypes[sContentType].DocumentTemplateUrl;
                SPFile spf = web.GetFile(sTemplate);
                byte[] binFile = spf.OpenBinary();
                // Url for file to be created
                string destFile = fcol.Folder.Url + "/" + sFilename;

                  
                SPFile addedFile = fcol.Add(destFile, binFile);
                SPItem newItem = addedFile.Item;
                newItem.Update();
                addedFile.Update();
                                    
                 SPQuery query = new SPQuery();
                 query.Query = "<Where><Eq>" + "<FieldRef Name='FileLeafRef' />" + "<Value Type='Text'>" + sFilename + "</Value>" + "</Eq>" + "</Where>";
                    
                SPListItemCollection collection = list.GetItems(query);
                 SPFile file = collection[0].File;
                 byte[] byteArray = file.OpenBinary();
                 using (MemoryStream memStr = new MemoryStream())
                 {
                     memStr.Write(byteArray, 0, byteArray.Length);
                       
                     using (WordprocessingDocument doc = WordprocessingDocument.Open(memStr, true))
                     {
                         //create XML string matching custom XML part
                      

                         MainDocumentPart main = doc.MainDocumentPart;
                         Table TabelaZapisnik = main.Document.Body.Descendants<Table>().First();
                         // Get the last row in the table.
                         TableRow Red = TabelaZapisnik.Elements<TableRow>().Last();
                         TableRow rowCopy = (TableRow)Red.CloneNode(true);
                         rowCopy.Descendants<TableCell>().ElementAt(0).Append(new Paragraph(new Run(new Text("1"))));
                         rowCopy.Descendants<TableCell>().ElementAt(1).Append(new Paragraph(new Run(new Text("Test1"))));
                         rowCopy.Descendants<TableCell>().ElementAt(2).Append(new Paragraph(new Run(new Text("Test2"))));
                         rowCopy.Descendants<TableCell>().ElementAt(3).Append(new Paragraph(new Run(new Text("Test3"))));
                         rowCopy.Descendants<TableCell>().ElementAt(4).Append(new Paragraph(new Run(new Text("Test4"))));
                         rowCopy.Descendants<TableCell>().ElementAt(5).Append(new Paragraph(new Run(new Text("Test5"))));
                         TabelaZapisnik.AppendChild(rowCopy);
                         // Remove the empty placeholder row from the table.
                         TabelaZapisnik.RemoveChild(Red);
                         // Save the changes to the table back into the document.
                         main.Document.Save();
                                               

                         //closing WordprocessingDocument automatically saves the document
                     }
                 }
                     //OpenXml kreiranje dokumenata - kraj
                    
              
                   
               return true;
            }
        }
        catch (SPException spEx)
        {
            // file already exists?
            if (spEx.ErrorCode == -2130575257)
                return false;
            else
                throw spEx;
        }`

the created document from template in document library is created but he is not updated with values: Test1,Test2,Test3,Test4 and Test5.
i set breakpoint on 'SPListItemCollection collection = list.GetItems(query); SPFile file = collection[0].File;' and i receive file, like collection[0].File {1/ЗППС-2021-12-Дом здравља - Вождовац.docx}
i debugged main.Document.Save(); and i receive 'main.Document.Save() Expression has been evaluated and has no value void'