using System;
using System.Windows.Forms;
using Microsoft.Reporting.WinForms; // Namespace for the control
using System.Data;
namespace MyReportingApp
public partial class Form1 : Form
public Form1()
InitializeComponent();
private void Form1_Load(object sender, EventArgs e)
// 1. Clear any previous data sources
            reportViewer1.LocalReport.DataSources.Clear();
// 2. Define the path to the RDLC file
            reportViewer1.LocalReport.ReportPath = "Report1.rdlc";
// 3. Fetch your data (Simulated here with a DataTable)
            DataTable myData = GetInvoiceData();
// 4. Create a ReportDataSource
            // The name "DataSet1" must match the name you set inside the RDLC designer
            ReportDataSource rds = new ReportDataSource("DataSet1", myData);
// 5. Add the data source to the viewer
            reportViewer1.LocalReport.DataSources.Add(rds);
// 6. Refresh the report to render
            this.reportViewer1.RefreshReport();
private DataTable GetInvoiceData()
// Simulate database retrieval
            DataTable dt = new DataTable();
            dt.Columns.Add("CustomerName", typeof(string));
            dt.Columns.Add("Amount", typeof(decimal));
            dt.Rows.Add("John Doe", 500.00m);
            dt.Rows.Add("Jane Smith", 1200.50m);
            return dt;

// Assume you have a method GetEmployees() returning List<Employee>
List<Employee> employees = EmployeeRepository.GetEmployees();
ReportDataSource dataSource = new ReportDataSource("EmployeeDataSet", employees);
reportViewer1.LocalReport.ReportPath = "Reports/EmployeeList.rdlc";
reportViewer1.LocalReport.DataSources.Clear();
reportViewer1.LocalReport.DataSources.Add(dataSource);
reportViewer1.RefreshReport();

ReportParameter param = new ReportParameter("ReportYear", "2024");
reportViewer1.LocalReport.SetParameters(new[]  param );

Microsoft Report Viewer

The visual studio designer can handle some binding, but for dynamic data, code-behind is preferred.

using System;
using System.Windows.Forms;
using Microsoft.Reporting.WinForms; // Namespace for the control
using System.Data;
namespace MyReportingApp
public partial class Form1 : Form
public Form1()
InitializeComponent();
private void Form1_Load(object sender, EventArgs e)
// 1. Clear any previous data sources
            reportViewer1.LocalReport.DataSources.Clear();
// 2. Define the path to the RDLC file
            reportViewer1.LocalReport.ReportPath = "Report1.rdlc";
// 3. Fetch your data (Simulated here with a DataTable)
            DataTable myData = GetInvoiceData();
// 4. Create a ReportDataSource
            // The name "DataSet1" must match the name you set inside the RDLC designer
            ReportDataSource rds = new ReportDataSource("DataSet1", myData);
// 5. Add the data source to the viewer
            reportViewer1.LocalReport.DataSources.Add(rds);
// 6. Refresh the report to render
            this.reportViewer1.RefreshReport();
private DataTable GetInvoiceData()
// Simulate database retrieval
            DataTable dt = new DataTable();
            dt.Columns.Add("CustomerName", typeof(string));
            dt.Columns.Add("Amount", typeof(decimal));
            dt.Rows.Add("John Doe", 500.00m);
            dt.Rows.Add("Jane Smith", 1200.50m);
            return dt;

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Be aware of these constraints before committing to the control: microsoft report viewer

---

// Assume you have a method GetEmployees() returning List<Employee>
List<Employee> employees = EmployeeRepository.GetEmployees();
ReportDataSource dataSource = new ReportDataSource("EmployeeDataSet", employees); The visual studio designer can handle some binding,
reportViewer1.LocalReport.ReportPath = "Reports/EmployeeList.rdlc";
reportViewer1.LocalReport.DataSources.Clear();
reportViewer1.LocalReport.DataSources.Add(dataSource);
reportViewer1.RefreshReport();
 Be aware of these constraints before committing to

Web (ASP.NET WebForms):

Server-side rendering:

Migration approaches:

This paper provides a detailed analysis of the Microsoft Report Viewer controls, focusing on their role within the .NET ecosystem for rendering business intelligence data. It explores the two distinct control types (WebForms and WinForms), the architectural shift from Report Definition Language (RDLC) client-side processing to server-side integration with SQL Server Reporting Services (SSRS), and the critical migration path from legacy versions to the modern Microsoft.ReportingServices.ReportViewerControl NuGet packages.

---

ReportParameter param = new ReportParameter("ReportYear", "2024");
reportViewer1.LocalReport.SetParameters(new[]  param );

This is the original version found in the System.Web and System.Windows.Forms namespaces. It is tightly coupled with the .NET Framework (versions 10.0 through 15.0).