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    copied!<p>You should really post the code of the class you're trying to serialize and deserialize. In the meantime, I'll make a guess.</p> <p>Most likely, the invalid character is in a field or property of type <code>string</code>. You will need to serialize that as an array of bytes, assuming you can't avoid having that character present at all:</p> <pre><code>[XmlRoot("root")] public class HasBase64Content { internal HasBase64Content() { } [XmlIgnore] public string Content { get; set; } [XmlElement] public byte[] Base64Content { get { return System.Text.Encoding.UTF8.GetBytes(Content); } set { if (value == null) { Content = null; return; } Content = System.Text.Encoding.UTF8.GetString(value); } } } </code></pre> <p>This produces XML like the following:</p> <pre><code>&lt;?xml version="1.0" encoding="utf-8"?&gt; &lt;root xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns:xsd="http://www.w3.org/2001/XMLSchema"&gt; &lt;Base64Content&gt;AAECAwQFFA==&lt;/Base64Content&gt; &lt;/root&gt; </code></pre> <hr> <p>I see you'd probably prefer VB.NET:</p> <pre><code>''# Prettify doesn't like attributes as the first item in a VB code block, so this comment is here so that it looks right on StackOverflow. &lt;XmlRoot("root")&gt; _ Public Class HasBase64Content Private _content As String &lt;XmlIgnore()&gt; _ Public Property Content() As String Get Return _content End Get Set(ByVal value As String) _content = value End Set End Property &lt;XmlElement()&gt; _ Public Property Base64Content() As Byte() Get Return System.Text.Encoding.UTF8.GetBytes(Content) End Get Set(ByVal value As Byte()) If Value Is Nothing Then Content = Nothing Return End If Content = System.Text.Encoding.UTF8.GetString(Value) End Set End Property End Class </code></pre>
 

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