Simple, you just need to change to parameter to achieve that!
1. Change Report Path
ReportViewer1.LocalReport.ReportPath = YOUR REPORT PATH
2. Add DataSource with exact DS name as defined in your RDLC file like this
var ReportDS= YOUR DATASET
ReportViewer1.LocalReport.DataSources.Add(new Microsoft.Reporting.WebForms.ReportDataSource()
{
Name="DSNAME",
Value = ReportDS
});
It's Done