c# - Error casting SqlDataReader DataItem to DataRowView on RowBound event of GridView -

i have gridview assign datasource , bind this:

protected void search(object sender, eventargs e) {     using(sqlconnection con = new sqlconnection(constring))     using(sqlcommand com = new sqlcommand("xxx", con))     {         com.commandtype = commandtype.storedprocedure;          // parameter declarations here          con.open();          sqldatareader rdr = com.executereader();         gvresults.datasource = rdr;         gvresults.databind();      } } 

there onrowbound method looks this:

protected void gvresults_onrowbound(object sender, gridviewroweventargs e) {        gridviewrow row = e.row;      if (row.rowtype != datacontrolrowtype.datarow) return;      datarowview rowdata = (datarowview)row.dataitem;      // fancy stuff happen here  } 

when line attempts cast row's dataitem datarowview reached error thrown reads:

unable cast object of type 'system.data.common.datarecordinternal' type 'system.data.datarowview'

i understand i'm not casting dataitem right kind of class, question what right class casting when datasource sqldatareader?

or on wrong track completely?

the correct type idatarecord