c# - "dataset does not support system.nullable" -


i creating crystal report in wpf , exception genrate "dataset not support system.nullable"

private void btngenratereport_click(object sender, routedeventargs e) {     reportdocument report = new reportdocument();     report.load("../../crystalreport1.rpt");     var q = (from c in db.tableclients              select new { c.clientid, c.name, c.city, c.phone, c.email }).toarray();      report.setdatasource(q);      crystalreportsviewer1.viewercore.reportsource = report; }


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