File not found error when uploading file using CSOM

Question

I am using following code to upload file at the following location but getting File Not Found error at last line "clientcontext.ExecuteQuery();"

using (ClientContext clientcontext = new ClientContext(txtSiteURL.Text))
{
      string fileToUpload = @"c:\test.txt";
      String fileName = System.IO.Path.GetFileName(fileToUpload);

      Folder folder = clientcontext.Web.Lists.GetByTitle("Docs").RootFolder;

      string documentUrl = txtSiteURL.Text + "/Docs/" + fileName;

      FileCreationInformation fci = new FileCreationInformation();
      fci.Overwrite = true;
      fci.Url = documentUrl;
      fci.Content = System.IO.File.ReadAllBytes(fileToUpload );

      Microsoft.SharePoint.Client.File uploadedFile = folder.Files.Add(fci);
      clientcontext.ExecuteQuery();
}

What am I doing wrong?

Answer 1

Try replacing line 8 from your code with this:

string documentUrl = txtSiteURL.Text + "Docs/" + fileName;

If the txtSiteURL.Text parameter already comes with a / at the end. the "/Docs/" string will cause a double forward slash in the url, and this bad url will cause a "File Not Found" error. (At least this was what caused that same error for me)

Also, try to debug that line and double check the fileName string does not generate problems like this, and check for other issues or typos.

Fixing the url resolved the "File Not Found" error for me.