How can i copy the contents of one FlowDocument to another FlowDocument below is what i tryed 

foreach (var blk in fd1.Blocks)
{
   fd2.Blocks.Add(blk);
}

fd1 is FlowDocument1 and fd2 is FlowDocument2.

But i get the below error.

Collection was modified; enumeration operation may not execute.

Thanks

Arvind

copy flowdocument
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