Saving and reding multiple dataset to and from XML

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XML

Windows

C#3.5

I have to save multiple datasets in XML and then I want to retrieve the datasets again.

as an example i have to retrive system information in two table at different times, I have scanned the system at 9 am with 3 tables say tbl_comp and tbl_processor and tbl_time I have saved it to xml.

<System>
  <tbl_time>
    <date>29/05/2013</date>
    <time>11:55</time>
  </tbl_time>
  <tbl_comp>
    <Name>Mycomp</Name>
    <OS>WINXP</OS>
    <RAM>2GB</RAM>
  </tbl_comp>
  <tbl_Processor>
    <ver>dualCore</ver>
    <speed>2ghz</speed>
  </tbl_Processor>
</System>
<System>
  <tbl_time>
    <date>29/05/2013</date>
    <time>13:55</time>
  </tbl_time>
  <tbl_comp>
    <Name>Mycomp</Name>
    <OS>WINXP</OS>
    <RAM>3GB</RAM>
  </tbl_comp>
  <tbl_Processor>
    <ver>dualCore</ver>
    <speed>2ghz</speed>
  </tbl_Processor>
</System>

both system ds are except the tbl_comp table column ram has been changed an dtbl_time has been changed

now I want to retrieve this as two datasets i.e. ds_1 and ds_2

please suggest a way to do so