Microsoft Report Viewer -

// 6. Refresh the report reportViewer1.RefreshReport(); Since there is no native .NET Core report viewer, you must use the WebForms control inside an ASP.NET Core project with the Microsoft.AspNetCore.SystemWebAdapters . This is an advanced scenario; for simpler web needs, consider rendering reports to PDF on the server and sending the PDF to the client.

// 4. Add the data source ReportDataSource rds = new ReportDataSource("SalesData", dt); reportViewer1.LocalReport.DataSources.Clear(); reportViewer1.LocalReport.DataSources.Add(rds); microsoft report viewer

// Using Microsoft.Reporting.NETCore (community) or the official package byte[] RenderReport(string reportPath, DataSet data) Scenario 1: WinForms with Local Mode (RDLC) This

Install-Package Microsoft.ReportingServices.ReportViewerControl.WebForms For .NET Core/5+ projects, you must enable EnableUnsafeBinaryFormatterSerialization due to legacy serialization requirements in the reporting engine. Integrating the Report Viewer into Your Application Let’s walk through two common scenarios: a WinForms application using Local Mode (RDLC) and an ASP.NET Core application (via WebForms compatibility). Scenario 1: WinForms with Local Mode (RDLC) This is the most common "offline" reporting pattern. or CSV) DataTable dt = GetSalesDataFromDatabase()

Open the RDLC file. Go to View → Report Data. Right-click DataSets → Add Dataset. Set the DataSource to MyDataSet and the available dataset to SalesData .

// 3. Define the report path (relative to the executable) reportViewer1.LocalReport.ReportPath = "Reports\\SalesReport.rdlc";

// 1. Fetch your data (could be from SQL, JSON, or CSV) DataTable dt = GetSalesDataFromDatabase();