c# - how to update sucessfully db field? -

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   string diagnostic = txtdiagnostic.text;    string sqlstr = "update consultasanimais set diagnostico='" + diagnostic + "' idconsultaanimal =" + idconsulta + " , idanimal=" + gridview2.datakeys[gridview2.selectedindex].value + "";      sqlcommand cmd = new sqlcommand(sqlstr, lbd.sqlcnn);      lbd.sqlcnn.open();      sqldatareader dados = cmd.executereader();      dados.close();     lbd.sqlcnn.close();

this code should updating diagnostico field on consultasanimais entity. no errors nor database data changes

use executenonquery() insert,update , delete queries:

int numofrowseffected = cmd.executenonquery();

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