ReportDocument rptDoc = new ReportDocument();

rptDoc.Load("x:\\crystalreport\\crPull.rpt");

TableLogOnInfo logOnInfo = new TableLogOnInfo();

logOnInfo = rptDoc.Database.Tables["tblMagUserInfo"].LogOnInfo;

ConnectionInfo connectionInfo = new ConnectionInfo();

connectionInfo = logOnInfo.ConnectionInfo;

connectionInfo.ServerName = "myserver";

connectionInfo.DatabaseName = "mydb";

connectionInfo.UserID = "myid";

connectionInfo.Password = "mypwd";

rptDoc.Database.Tables["tblMagUserInfo"].ApplyLogOnInfo(logOnInfo);

CrystalReportViewer1.ReportSource = rptDoc;