I can't get my code to update my xml file the code is

Code:
For Each node As XmlNode In xmlDoc.GetElementsByTagName("element")
            If node.Name = "ScheduledStationAETitle" Then
                node.InnerText = Station
            End If
        Next
my xml file is autogenerated by dumptoxml program
Code:
<?xml version="1.0"?>
<file-format>
  <meta-header xfer="1.2.840.10008.1.2.1" name="LittleEndianExplicit">
    <element tag="0002,0000" vr="UL" vm="1" len="4" name="MetaElementGroupLength">196</element>
    <element tag="0002,0001" vr="OB" vm="1" len="2" name="FileMetaInformationVersion" binary="hidden">
    </element>
    <element tag="0002,0002" vr="UI" vm="1" len="26" name="MediaStorageSOPClassUID">1.2.276.0.7230010.3.1.0.1</element>
    <element tag="0002,0003" vr="UI" vm="1" len="52" name="MediaStorageSOPInstanceUID">1.2.276.0.7230010.3.1.4.1439353403.3476.1265522799.1</element>
    <element tag="0002,0010" vr="UI" vm="1" len="20" name="TransferSyntaxUID">1.2.840.10008.1.2.1</element>
    <element tag="0002,0012" vr="UI" vm="1" len="28" name="ImplementationClassUID">1.2.276.0.7230010.3.0.3.5.4</element>
    <element tag="0002,0013" vr="SH" vm="1" len="16" name="ImplementationVersionName">OFFIS_DCMTK_354</element>
  </meta-header>
  <data-set xfer="1.2.840.10008.1.2.1" name="LittleEndianExplicit">
    <element tag="0008,0050" vr="SH" vm="0" len="0" name="AccessionNumber">
    </element>
    <element tag="0010,0010" vr="PN" vm="0" len="0" name="PatientsName">
    </element>
    <element tag="0010,0020" vr="LO" vm="0" len="0" name="PatientID">
    </element>
    <element tag="0010,0030" vr="DA" vm="0" len="0" name="PatientsBirthDate">
    </element>
    <element tag="0010,0040" vr="CS" vm="0" len="0" name="PatientsSex">
    </element>
    <element tag="0010,2000" vr="LO" vm="0" len="0" name="MedicalAlerts">
    </element>
    <element tag="0020,000d" vr="UI" vm="0" len="0" name="StudyInstanceUID">
    </element>
    <element tag="0032,1032" vr="PN" vm="0" len="0" name="RequestingPhysician">
    </element>
    <element tag="0032,1060" vr="LO" vm="0" len="0" name="RequestedProcedureDescription">
    </element>
    <sequence tag="0040,0100" vr="SQ" card="1" len="124" name="ScheduledProcedureStepSequence">
      <item card="11" len="116">
        <element tag="0008,0060" vr="CS" vm="1" len="2" name="Modality">MR
        </element>
        <element tag="0032,1070" vr="LO" vm="0" len="0" name="RequestedContrastAgent">
        </element>
        <element tag="0040,0001" vr="AE" vm="0" len="0" name="ScheduledStationAETitle">
        </element>
        <element tag="0040,0002" vr="DA" vm="1" len="18" name="ScheduledProcedureStepStartDate">
        </element>
        <element tag="0040,0003" vr="TM" vm="0" len="0" name="ScheduledProcedureStepStartTime">
        </element>
        <element tag="0040,0006" vr="PN" vm="0" len="0" name="ScheduledPerformingPhysiciansName">
        </element>
        <element tag="0040,0007" vr="LO" vm="0" len="0" name="ScheduledProcedureStepDescription">
        </element>
        <element tag="0040,0009" vr="SH" vm="0" len="0" name="ScheduledProcedureStepID">
        </element>
        <element tag="0040,0010" vr="SH" vm="0" len="0" name="ScheduledStationName">
        </element>
        <element tag="0040,0011" vr="SH" vm="1" len="8" name="ScheduledProcedureStepLocation">
        </element>
        <element tag="0040,0400" vr="LT" vm="0" len="0" name="CommentsOnTheScheduledProcedureStep">
        </element>
      </item>
    </sequence>
    <element tag="0040,1001" vr="SH" vm="0" len="0" name="RequestedProcedureID">
    </element>
    <element tag="0040,1003" vr="SH" vm="0" len="0" name="RequestedProcedurePriority">
    </element>
  </data-set>
</file-format>
Thanks for any assistance