Programmatically Add/Upload a file to Document Library in SharePoint 2010

Simple steps to upload a file programmatically to SPDocumentLibrary in SharePoint 2010

using (SPSite site = newSPSite("http://mySharePointServer"))

  {

using (SPWeb web = site.OpenWeb())

  {

SPSecurity.RunWithElevatedPrivileges(delegate()

               {

SPDocumentLibrary documentLib = web.Lists["YourLibraryName"] as SPDocumentLibrary;

Stream fStream = FileUpload1.PostedFile.InputStream;

byte[]  _byteArray = new byte[fStream.Length];

fStream.Read(_byteArray, 0, (int)fStream.Length);

fStream.Close();

web.AllowUnsafeUpdates = true;

string _fileUrl = documentLib.RootFolder.Url + "/" + FileUpload1.PostedFile.FileName;

bool IsOverwriteFile = true;

SPFile file = documentLib.RootFolder.Files.Add(_fileUrl, _byteArray, IsOverwriteFile);

SPListItem item = file.Item;

item["Title"] = FileUpload1.PostedFile.FileName;

item.Update();

file.Update();

web.AllowUnsafeUpdates = false;

              

      });           

 }

      

 }

Adding Folder and SubFolder to document library in SharePoint 2010

using (SPSite site = new SPSite("http://mySharePointServer"))

  {

   using (SPWeb web = site.OpenWeb())

   {

   SPSecurity.RunWithElevatedPrivileges(delegate()

     {

      SPDocumentLibrary documentLib = web.Lists["TestLib"] as SPDocumentLibrary;

      web.AllowUnsafeUpdates = true;

     SPListItem newFolder = documentLib.Items.Add("", SPFileSystemObjectType.Folder,"TestRootFolder");

   newFolder.Update();

//Creating Subfolder inside folder

stringsubFolderUrl = web.Url + "/" + newFolder.Url;

SPListItem subFolder = documentLib.Items.Add(subFolderUrl,SPFileSystemObjectType.Folder, "TestSubFolder");

subFolder.Update();

web.AllowUnsafeUpdates = false;

                });

            }

        }

References

http://www.sharepointpals.com/post/Programmatically-upload-and-retrieve-image-from-SharePoint-Picture-Library