System.Xml.XmlDocument.ConvertToNodeType C# (CSharp) Method

        internal XmlNodeType ConvertToNodeType(string nodeTypeString)
        {
            if (nodeTypeString == "element")
            {
                return XmlNodeType.Element;
            }
            else if (nodeTypeString == "attribute")
            {
                return XmlNodeType.Attribute;
            }
            else if (nodeTypeString == "text")
            {
                return XmlNodeType.Text;
            }
            else if (nodeTypeString == "cdatasection")
            {
                return XmlNodeType.CDATA;
            }
            else if (nodeTypeString == "entityreference")
            {
                return XmlNodeType.EntityReference;
            }
            else if (nodeTypeString == "entity")
            {
                return XmlNodeType.Entity;
            }
            else if (nodeTypeString == "processinginstruction")
            {
                return XmlNodeType.ProcessingInstruction;
            }
            else if (nodeTypeString == "comment")
            {
                return XmlNodeType.Comment;
            }
            else if (nodeTypeString == "document")
            {
                return XmlNodeType.Document;
            }
            else if (nodeTypeString == "documenttype")
            {
                return XmlNodeType.DocumentType;
            }
            else if (nodeTypeString == "documentfragment")
            {
                return XmlNodeType.DocumentFragment;
            }
            else if (nodeTypeString == "notation")
            {
                return XmlNodeType.Notation;
            }
            else if (nodeTypeString == "significantwhitespace")
            {
                return XmlNodeType.SignificantWhitespace;
            }
            else if (nodeTypeString == "whitespace")
            {
                return XmlNodeType.Whitespace;
            }
            throw new ArgumentException(SR.Format(SR.Xdom_Invalid_NT_String, nodeTypeString));
        }