If i have a string like this:

<Order   UserId=’ ‘  CustomerId=’ ’  TotalItem=’ ‘  TotalPrice=’ ‘>

<OrderLine  ItemId=’ ‘  Quantity=’ ‘  DiscountValue=’ ‘  TaxValue=’ ‘  Price=’ ‘     />

<OrderLine  ItemId=’ ‘  Quantity=’ ‘  DiscountValue=’ ‘  TaxValue=’ ‘  Price=’ ‘     />

<OrderLine  ItemId=’ ‘  Quantity=’ ‘  DiscountValue=’ ‘  TaxValue=’ ‘  Price=’ ‘     />

            …………………………………………………………………………………….........

</Order>

how do i do to convert above string to xml document