UploadReports.cs

var directoryDataSourcesFiles = Directory.GetFiles(uploadReportFolderPath + "\\" + Constants.DirectoryFolder.DataSources);
var directoryDatasetFiles = Directory.GetFiles(uploadReportFolderPath + "\\" + Constants.DirectoryFolder.Datasets);
var directoryReportFiles = Directory.GetFiles(uploadReportFolderPath + "\\" + Constants.DirectoryFolder.Reports);

LoadReportingService();

using (SPSite siteColl = new SPSite(dashboardWebUrl))
using (SPWeb site = siteColl.OpenWeb())
{
    IList<DataSourceFile> dataSourceFiles = UploadAndConfigureDataSourceFiles(site, directoryDataSourcesFiles);
    IList<DatasetFile> dataSetFiles = UploadAndConfigureDatasetFiles(dataSourceFiles, directoryDatasetFiles);
    IList<ReportFile> reportFiles = UploadAndConfigureReportFiles(site, directoryReportFiles, dataSetFiles);
    PublishFiles(dataSourceFiles, dataSetFiles, reportFiles);
}