Upload files in SharePoint Document Library using custom Webpart

Problem : Upload the file to SharePoint Document Library

Solution: Below is the code to upload the file to SharePoint Document Library.

  public string SingleUpload(FileUpload uploadFile, string tblName, string columnName, string itemID, string FolderName)
        {
            obDoc = dt.GetList<DesignDocumentDocument>(DesignDocument);
            string strReturn = string.Empty;
            objWeb = spSite.OpenWeb();
            if (uploadFile.PostedFile.FileName != string.Empty)
            {
                string fileName = Path.GetFileName(uploadFile.FileName);
                string destUrl = spSite.Url + "/" + FolderName + "/" + fileName;
                var lnqDesignDoc = from objDesignDoc in obDoc.ToList()
                                   where Convert.ToString(objDesignDoc.Name) == fileName
                                   select objDesignDoc;
                if (lnqDesignDoc.Count() > 0)
                {
                    strReturn = "0";
                }
                else
                {
                    SPWeb site = new SPSite(destUrl).OpenWeb();

                    SPList oList = objWeb.Lists[GenerateID];//"GenerateID"
                    SPListItemCollection reqGenCol = oList.Items;
                    SPListItem reqList = reqGenCol.GetItemById(GetListItemID(reqGenCol, "UploadID", "Title"));
                    int upldId = Convert.ToInt32(reqList["LastID"].ToString());

                    reqList["LastID"] = Convert.ToString(upldId + 1);
                    string strUpldID = reqList["LastID"].ToString();
                    reqList.Update();

                    Stream fStream = uploadFile.PostedFile.InputStream;
                    byte[] contents = new byte[fStream.Length];

                    fStream.Read(contents, 0, (int)fStream.Length);
                    fStream.Close();


                    EnsureParentFolder(site, destUrl);

                    site.Files.Add(destUrl, contents);

                    SPListItem slist = site.GetListItem(destUrl);
                    slist["itemID"] = itemID;
                    slist["ListName"] = tblName;
                    slist["ColumnName"] = columnName;
                    slist["DocID"] = upldId;
                    slist.Update();

                    //strFID = fileName;

                    //IndexCount = strFID.IndexOf('_');

                    //iConcat = IndexCount + 1;
                    //iFileCount = (strFID.Length) - (iConcat);
                    //strFileName = fileName.Substring(iConcat, iFileCount);

                    strReturn = upldId + "," + destUrl;

                }
            }
            return strReturn;
        }

        public string EnsureParentFolder(SPWeb parentSite, string destinUrl)
        {
            destinUrl = parentSite.GetFile(destinUrl).Url;

            int index = destinUrl.LastIndexOf("/");
            string parentFolderUrl = string.Empty;

            if (index > -1)
            {
                parentFolderUrl = destinUrl.Substring(0, index);

                SPFolder parentFolder
                    = parentSite.GetFolder(parentFolderUrl);

                //if (parentFolder.Exists)
                //{

                //    //return string.Empty;
                //}

                if (!parentFolder.Exists)
                {
                    SPFolder currentFolder = parentSite.RootFolder;

                    foreach (string folder in parentFolderUrl.Split('/'))
                    {
                        currentFolder
                            = currentFolder.SubFolders.Add(folder);
                    }
                }
            }
            return parentFolderUrl;
        }


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Thanks Happy SharePointers