// 3. Define the report path (relative to the executable) reportViewer1.LocalReport.ReportPath = "Reports\\SalesReport.rdlc";
LocalReport report = new LocalReport(); report.ReportPath = reportPath; report.DataSources.Add(new ReportDataSource("DataSet1", data.Tables[0])); string mimeType, encoding, fileNameExtension; Warning[] warnings; string[] streams; microsoft report viewer
// Using Microsoft.Reporting.NETCore (community) or the official package byte[] RenderReport(string reportPath, DataSet data) LocalReport report = new LocalReport()
// 1. Fetch your data (could be from SQL, JSON, or CSV) DataTable dt = GetSalesDataFromDatabase(); report.ReportPath = reportPath