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Uploading Multiple Files to SharePoint Document Library using .NET CSOM

Prerequisites

We need to have the  AJAX Control toolkit installed.

  1. Create an ASP.NET web application.



  2. Add SharePoint DLL References. These references can be found in “C:\Program Files\Common Files\Microsoft shared\Web Server Extensions\15\ISAPI”.

    In order to have this dll you need to install SharePoint Client SDK “https://www.microsoft.com/en-us/download/details.aspx?id=35585”



  3. Now on your web form, you need to drag AjaxFileUpload Controland ScriptManager.



  4. Now on OnUploadComplete create an Event.



    And paste the following code.
    1. protectedvoidOnUploadComplete(object sender, AjaxFileUploadEventArgs e)  
    2. {  
    3.     try  
    4.     {  
    5.         //gets the filename  
    6.         stringfileName = Path.GetFileName(e.FileName);  
    7.         //gets the temporary location of file and ID of folder where files are stored in temporary folder  
    8.         string path = Path.Combine(Path.GetTempPath(), "_AjaxFileUpload", e.FileId);  
    9.         //store the path in Sessio  
    10.         Session["FileDirectory"] = path;  
    11.         //get the site  
    12.         ClientContext context = newClientContext(siteUrl);  
    13.         //get the web object  
    14.         WeboWebsite = context.Web;  
    15.         context.Load(oWebsite);  
    16.         //execute the web object  
    17.         context.ExecuteQuery();  
    18.         //get the current list  
    19.         ListCurrentList = context.Web.Lists.GetByTitle(listName);  
    20.         context.Load(CurrentList.RootFolder);  
    21.         context.ExecuteQuery();  
    22.         //form the url to get the entire path of file like D://folder/test.txt  
    23.         StringfileURL = (path + "\\" + fileName);  
    24.         using(FileStreamfileStream = newFileStream(fileURL, FileMode.Open))  
    25.         Microsoft.SharePoint.Client.File.SaveBinaryDirect(context, CurrentList.RootFolder.ServerRelativeUrl.ToString() + "/" + e.FileName, fileStream, true);  
    26.     }  
    27.     catch (Exception ex)  
    28.     {  
    29.         lblError.Text = ex.ToString();  
    30.         lblError.BackColor = System.Drawing.Color.Red;  
    31.         lblError.ForeColor = System.Drawing.Color.White;  
    32.     }  
    33.     finally  
    34.     {  
    35.         //delete files from temp folder  
    36.         e.DeleteTemporaryData();  
    37.     }  
    38. }  
  5. Now run the application.






    Files are now uploaded to SharePoint.