Working with Crystal Report with c#

Monthly rpt = new Monthly();

            using (SqlConnection con = new SqlConnection(CS))

            {

                con.Open();

                SqlCommand cmd = new SqlCommand("spReport", con);

                cmd.CommandType = CommandType.StoredProcedure;

                cmd.ExecuteNonQuery();

                SqlDataAdapter da = new SqlDataAdapter(cmd);

                DataSet dsTemp = new DataSet();

                da.Fill(dsTemp, "tb_DentcoLab");

                DataTable dt = new DataTable();

                da.Fill(dt);

                dt = dsTemp.Tables["tb_DentcoLab"];

                

                 if (dt.Rows.Count > 0)

                {

                    ReportDocument repDoc = new ReportDocument();

// To show any value from Form1.cs to CrystalReport 

                    TextObject txtDateToFrom = (TextObject)rpt.ReportDefinition.ReportObjects["txtDateToFrom"];

                    txtDateToFrom.Text = "" + DateTime.Now.ToString("dd MMM yyyy") + "";

                    TextObject txtDocName = (TextObject)rpt.ReportDefinition.ReportObjects["txtDocName"];

                    txtDocName.Text = "" + txtDoctorName.Text + "";

                    TextObject txtAddress = (TextObject)rpt.ReportDefinition.ReportObjects["txtAddress"];

                    txtAddress.Text = "" + _DocAddress + "";

                    TextObject txtInvoiceNo = (TextObject)rpt.ReportDefinition.ReportObjects["txtInvoiceNo"];

                    txtInvoiceNo.Text = "" + txtInvoice.Text + "";

                    

                    rpt.SetDataSource(dsTemp);

                    RV.ReportSource = rpt;

                    RV.Zoom(1);

                }

                else

                {

                    MessageBox.Show("No Data found");

                }

            }

Note : 

TextObject of CrystalReport

["txtDateToFrom"],

["txtDocName"],

["txtAddress"],

["txtInvoiceNo"]  

RV is the name of CrystalReportViewer 

RV.Zoom(1) means zoom level set to whole page

RV.Zoom(2) means zoom level set to Page width