XElement value is always null

I have a XML document

<Root>
<Member xmlns:xsi="http://ift.tt/ra1lAU" xmlns:xsd="http://ift.tt/tphNwY" xmlns="urn:abc:xyz">
    <ID>123</Id>    
    <Name>
      <First>ABC</First>
      <Last>XYZ</Last>
    </Name>
    <DateOfBirth>1900-01-01</DateOfBirth>
    <Gender>Male</Gender>
  </Member>
  </Root>

Here is my code

XElement xmlRootElement = xdoc.Element("Root");
var x = xmlRootElement.Element("Member");

Why is the Member always Null?