I’m trying to upload files to a folder using SharePoint and C#.

I managed to create folders with my code and it works fine.

This is my Document class:

[DataContractAttribute] public class Document {     [DataMemberAttribute]     public string Name { get; set; }      [DataMemberAttribute]     public byte[] Content { get; set; }      [DataMemberAttribute]     public bool ReplaceExisting { get; set; }      [DataMemberAttribute]     public string Folder { get; set; }      [DataMemberAttribute]     public Dictionary<string, object> Properties { get; set; }      public Document()     {         Properties = new Dictionary<string, object>();     }      public Document(string name, byte[] content)     {         Name = name;         ReplaceExisting = false;         Content = content;         Properties = new Dictionary<string, object>();     }      public Document(string name, byte[] content, bool replace)     {         Name = name;          Content = content;         ReplaceExisting = replace;         Properties = new Dictionary<string, object>();     } } 

And this is the class where I use it to upload files (Document) to an existing SharePoint folder:

public class SharePointHandler : IDisposable {     private static string sharePointSite = "My Site";     private static string documentLibraryName = "Root folder";      public SharePointHandler() { }      public void Upload(List<Document> documents, string company, int year, string quarter)     {         string Year = year.ToString();          try         {             using (ClientContext context = new ClientContext(sharePointSite))             {                 var list = context.Web.Lists.GetByTitle(documentLibraryName);                 context.Load(list);                  var root = list.RootFolder;                 context.Load(root);                 context.ExecuteQuery();                 .                 .                 .                  foreach (var document in documents)                 {                     var fileCreationInformation = new FileCreationInformation();                     fileCreationInformation.Content = document.Content;                      fileCreationInformation.Overwrite = true;                      fileCreationInformation.Url = list.RootFolder.ServerRelativeUrl + "/" + company + "/" + Year + "/" + quarter + "/" + document.Name;                     Microsoft.SharePoint.Client.File uploadFile = quarterFolder.Files.Add(fileCreationInformation);                       foreach (KeyValuePair<string, object> property in document.Properties)                         uploadFile.ListItemAllFields[property.Key] = property.Value;                       try                     {                         uploadFile.CheckOut();                         context.ExecuteQuery();                     }                     catch (Exception ex)                     {                         Console.WriteLine(ex.Message);                     }                     uploadFile.ListItemAllFields.Update();                     context.ExecuteQuery();                      uploadFile.CheckIn("", CheckinType.MajorCheckIn);                     context.ExecuteQuery();                 }             }         }         catch (Exception ex)         {             EventLog.WriteEntry(ex.Message, EventLogEntryType.Error);             return;         }     }      public void Dispose() { } } 

When I run the code I have one document with:

Content: {byte[11430]}

Folder: null

Name: Testing.docx

Properties: Count = 0

ReplaceExisting: false

Everything works fine and I get the URL needed. But when I get to these commands:

try {     uploadFile.CheckOut();     context.ExecuteQuery(); } 

The program fails and I get error that says: File not found.

Are there any detailed tutorials out there? Or what am I doing wrong?