Question

Using a file upload c# webform to insert some records into database. Any errors I get I am adding to a list. After all records inserted i use linq to see if the list of errors has anything in it if it does. I write it to another list and then foreach record in this list I write out the error in a label on screen. Get the error in the linq to list that Object not set to an instance of an object.

List<Cups> errors = FDloads.Where(c => c.DataErrors.Count > 0).ToList();

        if (errors.Count > 0)
        {
            Label1.Text = "Errors:";
            foreach (Cups err in errors)
            {
                Label1.Text += "<br/>" +  err.Lion + "," + err.Value;
            }
        }
        else
        {
            Label1.Text = "Success.";
        }

Errors happens write at linq line when I write the errors count in list FDloads to a new list and if it contains anything do this, if not do this…

Answer 1

Please try:

List<Cups> errors = FDloads.Where(c => c.DataErrors != null && c.DataErrors.Count > 0).ToList();