NullReferenceException thrown when appending child to xml document

Question

I have an aspx page that accepts 3 user inputs called

1. Name
2. Date
3. Description

I want to create an xml document using these. When I try to append the child, I get a NullReferenceException with a detail of

{"Object reference not set to an instance of an object."}

Here is my code

            string name = EventName.Text;
            string date = DatePicker.SelectedDate.ToString();
            string description = NewsDescription.Text;

            //Create XML Document
            XmlDocument doc = new XmlDocument();

            //Event Name
            XmlElement elem = doc.CreateElement("Name");
            XmlText text = doc.CreateTextNode(name.ToString());
            doc.DocumentElement.AppendChild(elem);
            doc.DocumentElement.AppendChild(text);

            //Event Date
            XmlElement elem2 = doc.CreateElement("Date");
            XmlText text2 = doc.CreateTextNode(date.ToString());
            doc.DocumentElement.AppendChild(elem2);
            doc.DocumentElement.AppendChild(text2);

            //Event Description
            XmlElement elem3 = doc.CreateElement("Description");
            XmlText text3 = doc.CreateTextNode(description.ToString());
            doc.DocumentElement.AppendChild(elem3);
            doc.DocumentElement.AppendChild(text3);

            doc.Save(Console.Out);

Answer 1

doc has no Element yet.

XmlElement elem = doc.CreateElement("Name"); // is just declaration

So,

doc.DocumentElement.AppendChild(elem);

Should be:

doc.AppendChild(elem);