水晶报表问题
SqlConnection con = new SqlConnection"server=localhost;database=pubs;uid=sa");
SqlCommand com = con.CreateCommand();
com.CommandText= "select * from authors";
SqlDataAdapter ad = new SqlDataAdapter();
ad.SelectCommand = com;
DataSet ds = new DataSet();
con.Open();
ad.Fill(ds,"t");
CrystalReport1 cr = new CrystalReport1();
cr.SetDataSource(ds);
cr.Refresh();
this.CrystalReportViewer1.ReportSource = cr;
我这样写了以后,它报错是CrystalDecisions.CrystalReports.Engine.LogOnException: 登录失败
报表是用向导做的,是什么问题或者给一些代码