Writing value to excel file

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C#

Office

MS-Excel

Hi I have following code that works fine, I can get values and add them to excel sheet. Only problem i have is last line

xla.Cells[add, 4] = anchorlist;

it wont print the value for this anchor text "Missing parameter does not have a default value. Parameter name: parameters"
any idea how to fix it? Thanks

Match hrefcheck = hrefRegex.Match(htmlpage);
                    ArrayList linklist = new ArrayList();

                    // linklist.Add("<BASE href=\"" + url + "\">" + url);
                    ArrayList anchorlist = new ArrayList();
                    while (hrefcheck.Success)
                    {
                        string href = hrefcheck.Groups["href"].Value; //link url
                        string attr = hrefcheck.Groups["Anchor"].Value;
                        anchorlist.Add(attr);
                        linklist.Add(href);
                        hrefcheck = hrefcheck.NextMatch();
                    }

                    string matchurl = "xyz.com";

                    foreach (string str in linklist)
                    {
                        if (str.Contains(matchurl) == true)
                        {
                           
                            Microsoft.Office.Interop.Excel.Application xla = new Microsoft.Office.Interop.Excel.Application();
                            Workbook wb = xla.Workbooks.Add(XlSheetType.xlWorksheet);
                            Worksheet ws = (Worksheet)xla.ActiveSheet;
                            xla.Visible = true
                            xla.Cells[add, 1] = urltextBox.Text;
                            xla.Cells[add, 2] = str;
                            xla.Cells[add, 3] = s;
                            xla.Cells[add, 4] = anchorlist;
                           
                       }

                    }