Prova...

codice:
sqlStr = "UPDATE TBL_SERATE SET DATA = # " + columnData + "#" _ 
+ ",  SERATA = '" + columnSerata.ToString + "'" _ 
+ ", ARTISTA = '" + columnArtista.ToString + "'" _ 
+ ", TIPO_SERATA = '" + columnTipoSerata.ToString + "'" _ 
+ ", IMG_LOCANDINA = '" + columnImgLocandina.ToString + "'" _ 
+ ", IMG_VIEW = '" + columnView + "'" _ 
+ ", WINDOWS = '" + columnWindows.ToString + "'" _ 
+ " WHERE ID = " + intPid.ToString