crystal report wants db login and nullable problems

Question

hi guys i wonder if someone can answer my question .

i use this following code for printing some data from sqlserver database and my database dosent have any permission or logins just windows authentications i use following code but

i have this error(DataSet does not support System.Nullable<>)

and when in print form i use the same code i have database login error that does not solve anyway

 private void button7_Click(object sender, EventArgs e)
 {
   print_form fm = new print_form();
   mydbDataContext db = new mydbDataContext();
   CrystalReport1 cm = new CrystalReport1();
   cm.SetDataSource(dataGridView3.DataSource);
   fm.crystalReportViewer1.ReportSource = cm;
   fm.Show();
   }

please help me and i use visual studio 2012 and newest crystal report package

Answer 1

Crystal report will not support Nullable variable or property , if you have create Nullable variable or property then Crystal report will throw error. so you have to use non Nullable propety.

please refer below link.

Crystal report not support null Datetime