IB filename

call.cs

string fullPath = Server.MapPath(FileUploadHelper.formFullPath(id.ToString(), fileUploadType, filename));

public static string formFullPath(Object id, FileUploadType type, Object fileName)
{
    return formFullPath(id, type, fileName, false, null);
}

public static string formFullPath(Object id, FileUploadType type, Object fileName, bool needsMapping, HttpServerUtility server)
{
    String fullPath = null;
    switch (type)
    {
        case FileUploadType.BusinessYearReport : fullPath = Constants.DirPaths.BusinessYearReport; break;
    }
    if (fullPath != null)
    {
        string path = fullPath + GetIdPath(id) + "\\" + fileName;

        if (needsMapping)
        {
            if (File.Exists(server.MapPath(path)))
            {
                return path;
            }
            else
            {
                BusinessYearReport byr = new BusinessYearReport();
                businessyearreportEntityCollection ents = byr.GetBusinessYearReportByReportFile(fileName.ToString(), Convert.ToDecimal(id));

                if (ents == null) return "";

                foreach(businessyearreportEntity ent in ents)
                {
                    path = fullPath + GetIdPath(ent.Id) + "\\" + fileName;

                    if(File.Exists(server.MapPath(path)))
                    {
                        return path;
                    }
                }

                return ""; 
            }
        }
        
        return path;
    }
    return "";
}

more.cs

        private static string GetIdPath(Object id)
        {
            int n = 2;
            Stack<char> s = new Stack<char>(id.ToString().ToCharArray());
            System.Text.StringBuilder idpath = new System.Text.StringBuilder();
            while (s.Count > 0)
            {
                int counter = 0;

                if (s.Count % 2 == 1)
                {
                    counter = n - 1;
                }
                else
                {
                    counter = n;
                }

                System.Text.StringBuilder tempStr = new System.Text.StringBuilder();
                for (int i = 0; i < counter; i++)
                {
                    tempStr.Append(s.Pop());
                }
                idpath.Append("\\").Append(tempStr.ToString());
            }
            return idpath.ToString();
        }