CrystalReport asks login details every time in C#.net

How to pass Login details to CrystalReport in C#.net
Dynamically passing DataBase Login details to Crystal Reports in C#.net.

Add references :

" using CrystalDecisions.CrystalReports.Engine"
"using CrystalDecisions.Shared"

Passing Databse login details:

{

 ReportDocument rdc1 = new ReportDocument();
            TableLogOnInfos tli = new TableLogOnInfos();
            TableLogOnInfo tloi = new TableLogOnInfo();
            ConnectionInfo cinf = new ConnectionInfo();
            Tables crtables;

//here my report is saved in Debug folder of my project.

            rdc1.Load("test.rpt");
            cinf.ServerName = "system1";
            cinf.DatabaseName = "testdb";
            cinf.UserID = "uid";
            cinf.Password = "pwd";

            crtables = rdc1.Database.Tables;

            foreach (CrystalDecisions.CrystalReports.Engine.Table ctable in crtables)
            {
                tloi = ctable.LogOnInfo;
                tloi.ConnectionInfo = cinf;

                ctable.ApplyLogOnInfo(tloi);
            }


//"report" is a form which contains CrystalReportViewer on it.

            report rt = new report();
            rt.crystalReportViewer1.ReportSource = rdc1;


//if there is any parameters to send to report then send those parameters by using property  "SelectionFormula".

syntax:         rt.crystalReportViewer1.SelectionFormula = "{empl.pid}=" + textBox.Text;
            rt.Show();
         

//here empl.pid is the column name to send to crystalreport //column name must  in {} only i.e{empl.pid}.

}