sql server - C# SqlGeometry DataTable.WriteXml -

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i have table in sql server column of type sqlgeometry. loading datatable, i'm executing datatable.writexml. unfortunately, data column of type sqlgeometry not written out.

        datatable dt = new datatable();         string tabela = string.empty;         tabela = "x.yz";         string sqlconstring = @"server=xxx.xxx.xxx.xxx\sqlexpress2012;database=xxx;user id=xx;password =xx; ";         string sqlquery = string.format("select * {0}",tabela);         using (sqlconnection sqlcon = new sqlconnection(sqlconstring))         {             sqlcommand sqlcmd = new sqlcommand(sqlquery, sqlcon);             try             {                 sqlcon.open();                 sqldatareader dr = sqlcmd.executereader();                 dt.load(dr);             }             catch (exception e)             {                 console.writeline(e.message);             }         }          dt.tablename = "123";         dt.writexml(@"j:\tmp\3.xml");

instead of set of data only:

<?xml version="1.0" standalone="yes"?> <documentelement>   <_x0031_23>     <featid>5662</featid>     (...)     <geom xmlns:xsd="http://www.w3.org/2001/xmlschema" xmlns:xsi="http://www.w3.org/2001/xmlschema-instance">       <stsrid>2180</stsrid>     </geom>   </_x0031_23>   <_x0031_23>     <featid>5663</featid> (...)

how saved geometric data?


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