CheckOut/CheckIn when uploading a file

Hi,

I have created a custom form to upload files to a library. Users can provide comments that are stored by calling CheckOut and CheckIn methods on the file. The problem is when the file is checked-in an Access Denied exception is thrown. The user seems to have all required permissions (e.g. EditListItems, OverrideCheckOut, etc.)

Has anyone had a similar problem with the Access Denied exception during checking-in a file programmatically?

This is the C# code:

private void UploadFile(Guid listId, int listItemId, string currFolder)
{
    String sharePointSite = SPContext.Current.Web.Url;
    using (SPSite site = new SPSite(sharePointSite))
    {
        using (SPWeb web = site.OpenWeb())
        {
            // Get the list.
            SPListCollection lists = web.Lists;
            lists.ListsForCurrentUser = true; 
            SPList list = lists.GetList(listId, false);
            // Get the selected list item.
            SPListItem item = list.GetItemById(listItemId);
            if (item.File == null)
                throw new ArgumentException("This list item cannot have file versioning.");
            string itemFilename = item.File.Name;
            // Get data from the form.
            // InputFile, VersionComment, and chkOverwriteProperties are web controls.
            String fileToUpload = InputFile.Value.Trim();
            String comments = VersionComment.Text;
            bool overwriteProperties = chkOverwriteProperties.Checked;
            // Validate the file extension.
            if (Path.GetExtension(fileToUpload) != Path.GetExtension(itemFilename))
                throw new ArgumentException("The selected file has a different extension than the file to upload.");
            SPFolder folder = null;
            if (currFolder == "")
                folder = list.RootFolder;
            else
                folder = FindSubFolder(web.RootFolder, currFolder);
            SPFile spfile = null;
            // Prepare for upload
            bool overwriteExistingFile = true;
            bool checkRequiredFields = true;
            Stream stream = InputFile.PostedFile.InputStream;
            byte[] contents = new byte[stream.Length];
            stream.Read(contents, 0, (int)stream.Length);
            stream.Close();
            // Add the file to the library.
            if (overwriteProperties)
                spfile = folder.Files.Add(itemFilename, contents, overwriteExistingFile, comments, checkRequiredFields);
            else
            {
                spfile = folder.Files.Add(itemFilename, contents, item.Properties, overwriteExistingFile);
                spfile.CheckOut();
                // Update the comment.
                // THIS LINE THROWS THE "ACCESS DENIED" EXCEPTION
                spfile.CheckIn(comments, SPCheckinType.OverwriteCheckIn);
            }
            if (spfile != null)
            {
                folder.Update();
            }
            else
            {
                throw new ApplicationException("Uploading the file failed.");
            }
        }
    }
}

and this is the part of the web form containing the web controls:

<input type="file" id="InputFile" runat="server" class="ms-fileinput" size="35" /><br /><asp:TextBox TextMode="MultiLine" Rows="5" Columns="45" id="VersionComment" MaxLength="1023" class="ms-long" runat="server" /><br /><asp:CheckBox ID="chkOverwriteProperties" Checked="false" runat="server" /><br />

Thanks,

Leszek

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