send value to crystal report at runtime

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C#

i am trying to put filter to filter values from database and then show through crystal report... I tried google my problem but failed to get my answer.. pls help..

private void button1_Click(object sender, EventArgs e)
        {
            creport crpt = new creport();
            billwisecrystalrpt objReport = new billwisecrystalrpt();
           crpt.crystalReportViewer1.SelectionFormula   ="{Projects.challanno} =" +txtbillno.Text;
           
           crpt.crystalReportViewer1.ReportSource = objReport;

        }

With the help of this code i am getting single value but i inseted 10 value on a single ID. I thought i will get all the values but didn't..

Need help..

Thankyou...