Search string in OpenXml SpreadsheetDocument and return Cell Reference

OpenXmlSearchString.cs

private static StringValue? SearchString(string searchString, WorkbookPart workbookPart, WorksheetPart worksheetPart)
    {
        var sharedTable = workbookPart.SharedStringTablePart;
        var sharedStringValues = new List<SharedStringItem>();
        if (sharedTable != null)
        {
            sharedStringValues =
                sharedTable.SharedStringTable.Elements<SharedStringItem>().ToList();

        }
        var cells = worksheetPart.Worksheet.Descendants<Cell>();

        StringValue? cellRef = new();
        foreach (Cell cell in cells)
        {
             
            if (sharedStringValues != null
                && sharedStringValues.Any()
                && cell.DataType != null
                && cell.DataType.Value == CellValues.SharedString)
            {               

                if (int.TryParse(cell.CellValue?.Text, out int index))
                {
                    var value = sharedStringValues[index].InnerText;
                    if (value == searchString)
                    {
                        cellRef = cell.CellReference;
                        break;
                    } 
                }

            }
            else
            {
                if (cell.CellValue?.Text == searchString)
                {
                    cellRef = cell.CellReference;
                    break;
                }
            }
            if (cell.CellFormula != null)
            {
                if (cell.CellFormula.Text == searchString)
                {
                    cellRef = cell.CellReference;
                    break;
                }
            }
        }
        return cellRef;
    }