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    copied!<p>As a response to your comment about modifying it in memory:</p> <p>Consider writing a schema like this:</p> <pre><code>&lt;?xml version="1.0" encoding="utf-8"?&gt; &lt;xs:schema xmlns:xs="http://www.w3.org/2001/XMLSchema"&gt; &lt;xs:complexType name="FromType"&gt; &lt;xs:attribute name="Address" type="xs:string"/&gt; &lt;/xs:complexType&gt; &lt;xs:simpleType name="RecipientMethod"&gt; &lt;xs:restriction base="xs:string"&gt; &lt;xs:enumeration value="To"/&gt; &lt;xs:enumeration value="Cc"/&gt; &lt;xs:enumeration value="Bcc"/&gt; &lt;/xs:restriction&gt; &lt;/xs:simpleType&gt; &lt;xs:complexType name="RecipientType"&gt; &lt;xs:attribute name="Type" type="RecipientMethod"/&gt; &lt;xs:attribute name="Address" type="xs:string"/&gt; &lt;/xs:complexType&gt; &lt;xs:complexType name="Email"&gt; &lt;xs:sequence&gt; &lt;xs:element name="From" type="FromType" minOccurs="1" maxOccurs="1"/&gt; &lt;xs:element name="Recipient" type="RecipientType" minOccurs="1" maxOccurs="unbounded"/&gt; &lt;xs:element name="Subject" type="xs:string" minOccurs="0" maxOccurs="1"/&gt; &lt;xs:element name="Body" type="xs:string" minOccurs="0" maxOccurs="1"/&gt; &lt;/xs:sequence&gt; &lt;/xs:complexType&gt; &lt;xs:complexType name="Emails"&gt; &lt;xs:sequence&gt; &lt;xs:element name="Emails" type="Email" minOccurs="1" maxOccurs="unbounded"/&gt; &lt;/xs:sequence&gt; &lt;/xs:complexType&gt; &lt;xs:element name="Emails" type="Emails"/&gt; &lt;/xs:schema&gt; </code></pre> <p>and run the schema compiler xsd.exe on it (<a href="http://msdn.microsoft.com/en-us/library/x6c1kb0s.aspx" rel="nofollow noreferrer">here</a>) </p> <p>With the class it generates, you just set the members, like this:</p> <pre><code>Emails e= new Emails(); e.Email = new Email[2]; e.Email[0] = new Email(); e.Email[0].From = new FromType(); ... </code></pre> <p>Once the members are set, then do this:</p> <pre><code>FileStream f ... XmlSerializer x = new XmlSerializer( e, f ); x.Serialize(e); </code></pre> <p>Similarly, you can deserialize:</p> <pre><code>Emails ne = x.DeSerialize(); </code></pre> <p>Then modify it to add a new Email:</p> <pre><code>Email newEmail = Email[ne.Email.Length + 1]; for(int i = 0; i &lt; ne.Email.Length; i++) newEmail[i] = ne.Email[i]; newEmail[ne.Email.Length] = new Email(); .... ne.Email = newEmail; </code></pre> <p>then serialize it back.</p>
 

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