Memorymapped streamcontent xml problem

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XML

C#4.0

This is my xml data.It is saved in memorymapped streamcontent as bytearray.

<XMLData entity_name="Resource" >
<PolicyList>
<Policy>
<Resource>Resource1</Resource>
<Status>Active</Status>
</Policy>
<Policy>
<Resource>Resource2</Resource>
<Status>Active</Status>
</Policy>
</PolicyList>
</XMLData>

if i delete resource2, i construct new xml as

<XMLData entity_name="Resource" >
<PolicyList>
<Policy>
<Resource>Resource1</Resource>
<Status>Active</Status>
</Policy>
</PolicyList> 
</XMLData> 

i will update this new xml in memorymapped stream content as bytearray in existing one using hashkey.
after i read the streamcontent as follows,

<XMLData entity_name="Resource" >
<PolicyList>
<Policy>
<Resource>Resource1</Resource>
<Status>Active</Status>
</Policy>
</XMLData>ource2</Resource><Status>Active</Status></Policy></PolicyList></XMLData>

extra xml tags are appended with previous one.
i tried, memorymappedfile dispose,streamcontet flush,dispose all those thing.
it is happening for remove the content from xml tag from previous one.if we add it thats not a problem.
if i set as bytearray as null, it gives exception.


but i need below xml,

<XMLData entity_name="Resource" >
<PolicyList>
<Policy>
<Resource>Resource1</Resource>
<Status>Active</Status>
</Policy>
</PolicyList> 
</XMLData> 

please any one solves this issue..

thanks in advance