You can use the ASP.NET WebForms Viewer control with .NET Framework 4.6.2 - 4.8.1. only.

The WebViewer control that is licensed with the Professional Edition allows you to quickly display reports in Web applications. Once you drop the control onto a Web Form, you can look in the Visual Studio Properties grid and select the ViewerType that you want to use.

The WebViewer control supports the following types:

• HTMLViewer (default): Provides a scrollable view of a single page of the report at a time. Downloads only HTML and java script to the client browser. Not recommended for printable output.
• RawHTML: Shows all pages in the report document as one continuous HTML page. Provides a static view of the entire report document, and generally printable output, although under some circumstances pagination is not preserved.
• AcrobatReader: Returns output as a PDF document viewable in Acrobat Reader.
  Client requirements: Adobe Acrobat Reader

In a WebViewer, an RDLX report can be rendered in two modes - Paginated and Galley. Using galley mode, you can view the contents of the RDLX report in a single and scrollable page. You can set Galley mode through UI of the WebViewer or through code by setting RenderMode property to Galley.

You should use the ReportName property to specify a report for the viewer to display. Also, you must add the api/reporting/* HTTP handler to your 'web.config' file and corresponding UseReportViewer call to 'Global.asax' for this ViewerType to work properly.

Use the WebViewer control

1. In Visual Studio, create a new ASP.NET Web Forms Application.
2. To install NuGet package for MESCIUS.ActiveReports.Web, go to Tools > NuGet Package Manager > Manage NuGet Packages for Solution..., browse for the package and click Install.
3. In Solution Explorer, right-click the project and select Add > New Item.
4. Select WebForm and click Add.
5. Go to the Design tab of the newly added WebForm and drag and drop the WebViewer control to the WebForm designer.
   Note: if you get an error on adding the WebViewer control, you should install or upgrade the Microsoft.CodeDom.Providers.DotNetCompilerPlatform NuGet package. See Troubleshooting for details.

Preview Code-Based Section Reports in WebViewer control

You need to update the Global.asax file as follows:

public class Global : System.Web.HttpApplication
    {
        protected void Application_Start(object sender, EventArgs e)
        {
            this.UseReporting(settings =>
            {
                settings.UseFileStore(new DirectoryInfo(Server.MapPath("~")));
                settings.UseCompression = true;
                settings.UseCustomStore(GetReport);
            });
        }
        public object GetReport(string reportName = "SectionReport")
        {
            SectionReport1 rpt = new SectionReport1();
            return rpt;
        }
    }

Public Class _Global
    Inherits System.Web.HttpApplication
    Protected Sub Application_Start(ByVal sender As Object, ByVal e As EventArgs)
        Me.UseReporting(Sub(settings)
                            settings.UseFileStore(New DirectoryInfo(Server.MapPath("~")))
                            settings.UseCompression = True
                            settings.UseCustomStore(AddressOf GetReport)
                        End Sub)
    End Sub
    Public Function GetReport(ByVal Optional reportName As String = "SectionReport") As Object
        Dim rpt As SectionReport1 = New SectionReport1()
        Return rpt
    End Function
End Class