I have a function to help my editors publsh keywords based n existing child content:

However what ever I do i end up hitting a String or binary data would be truncated...

I am getting a Node

  var rs = ApplicationContext.Current.Services.ContentService;
                    var content = rs.GetById(NodeId);

populating the properties for the IContent node

 KeywordsList.AddRange(dCurrentKeyWords);
                    if (dContent.HasProperty("supplierKeyWords")) {
                        string xyz = string.Join(",", KeywordsList);
                        dContent.Properties["supplierKeyWords"].Value = xyz;
                }

Yes I tries it as dContent.SetValue("supplierKeyWords") and then trying to pubilsh the updated value

  try
                    {
                        rs.SaveAndPublishWithStatus(dContent, 0, false);
                        return true;
                    }
                    catch (Exception ex)
                    {
                        LogHelper.Info<ContentService>("There was issue with Keywords in DMC Suppliers  (DMC: " + ContentNode.Name + ") :Keywords" + KeywordsList + " Error ::" + ex);
                        return false;
                    }

and I get a error: String or binary data would be truncated it looks related to this error: but I've tried it with textArea, textbox and tags https://our.umbraco.com/forum/core/general/40332-Unable-to-publish-String-or-binary-data-would-be-truncated

I'm obviously reluctant to tweak the database.. unless absolutely necessary.. I'm running 7.7.6 and i can't see any obvious reason why i can't save the string

Ravi