How to add a complex type attribute contexttype or mimetype xml.serialization wsdl C#

See more:

C#

webservice

WSDL

Hello! I'm trying to add to a complex type context type or mime type (wsdl webservice xml serialization C#)

[System.Xml.Serialization.XmlElementAttribute("arg1", typeof(System.Byte[]), DataType = "base64Binary")]<br />
    public byte[] arg1<br />
    {<br />
        get<br />
        {<br />
            return this.objectFild;<br />
        }<br />
<br />
        set<br />
        {<br />
            this.objectFild = value;<br />
        }<br />
    }

But nothing comes out

need what would have happened so

<s:complexType>
<s:sequence>
<s:element minOccurs="0" maxOccurs="1" name="arg1" type="s:base64Binary" ContentTypes="application/octet-stream"/></s:sequence>
</s:complexType>

What I have tried:

[System.Xml.Serialization.XmlElementAttribute("arg1", typeof(System.Byte[]), DataType = "base64Binary")]
    public byte[] arg1
    {
        get
        {
            return this.objectFild;
        }

        set
        {
            this.objectFild = value;
        }
    }