Add multiple elements to XML C# using textwriter

Question

I need the following output

<BatchFile>
   <BatchFileHeader>
     <MessageType>MSG103</MessageType>
     <Version>456</Version>
   <BatchFileHeader>

   <Vendor>
     <VendorType>VVV</VendorType>
   </Vendor>
</BatchFile>

Following is my code

StringWriter stringwriter = new StringWriter();
XmlTextWriter xmlTextWriter = new XmlTextWriter(stringwriter);
xmlTextWriter.Formatting = Formatting.Indented;
xmlTextWriter.WriteStartDocument();

xmlTextWriter.WriteStartElement("BatchFileHeader");
xmlTextWriter.WriteElementString("MessageType", "MSG103"); 
xmlTextWriter.WriteElementString("MessageVersion", "456"); 
xmlTextWriter.WriteEndElement();

xmlTextWriter.WriteStartElement("Vendor");
xmlTextWriter.WriteElementString("Vendor", "VVV"); 
xmlTextWriter.WriteEndElement();

But I get the following error

token startelement in state epilog would result in an invalid xml document

What am I doing wrong ?

Answer 1

You forgot to write the outermost StartElement <BatchElement> .

Adding he following should fix your problem;

StringWriter stringwriter = new StringWriter();
XmlTextWriter xmlTextWriter = new XmlTextWriter(stringwriter);
xmlTextWriter.Formatting = Formatting.Indented;
xmlTextWriter.WriteStartDocument();

xmlTextWriter.WriteStartElement("BatchElement");

xmlTextWriter.WriteStartElement("BatchFileHeader");
xmlTextWriter.WriteElementString("MessageType", "MSG103"); 
xmlTextWriter.WriteElementString("MessageVersion", "456"); 
xmlTextWriter.WriteEndElement();

xmlTextWriter.WriteStartElement("Vendor");
xmlTextWriter.WriteElementString("Vendor", "VVV"); 
xmlTextWriter.WriteEndElement();

xmlTextWriter.WriteEndElement();
xmlTextWriter.WriteEndDocument();