Steps to generate a report using CrystalReportViewer

Drag and drop CrystalReportViewer

Add DataSet

Click add

Click on server explorer

Drag and Drop table

Now add CrystalReport

Click add

Click  Ok

Expand create ProjectData

Expand AD.NET Datasets and select table and then click next

Click highlighted array to select field and click next

Click next

Click next

Click finish

protected void Page_Load(object sender, EventArgs e)
{
//To instantiate a ReportBuilder, you must provide the ReportDocument to be built.
ReportDocument ReportDocument1 = new ReportDocument();
//Loading Crystal Report to Report Object
reportDocumentObj.Load(Server.MapPath("~/CrystalReport.rpt"));
//Creating instance of Data Table created earlier.
DataSet1.regformDataTable dt = new DataSet1.regformDataTable();
DataSet1TableAdapters.regformTableAdapter da = new DataSet1TableAdapters.regformTableAdapter();
//Filling data table
 da.Fill(dt);
//Setting Data Source of Report Document.
 ReportDocument1.SetDataSource((DataTable)dt);
//Assigning object of ReportDocument to Crystal Report as ReportSource
 CrystalReportViewer1.ReportSource = ReportDocument1;  
}
// Use namespace CrystalDecisions.CrystalReports.Engine;

Now Report is generated.

Read also this Article - Using ReportViewer in WinForms C#