How do I link the main report with the subreport RDLC asp.net Core

Question

How do I link the main report with the subreport RDLC asp.net Core

 

public IActionResult PrintTwo()
{
    var dt = new DataTable();
    var dtSub = new DataTable();

    DataTable[] dtArray = new DataTable[2];

    dtArray = GetEmployeeList();
    string mimetype = "";
    int extension = 1;
    var path = $"{this._webHostEnvironment.WebRootPath}\\Reports\\ReportRdlcTwo.rdlc";
    var pathSub = $"{this._webHostEnvironment.WebRootPath}\\Reports\\subReport.rdlc";

    Dictionary<string, string> parameters = new Dictionary<string, string>();
    //Dictionary<string, string> parametersSub = new Dictionary<string, string>();

    parameters.Add("prm", "Z. Apple. An apple is just an apple. BMW. The accidental propeller. Chupa");
    //parametersSub.Add("subReportParameter", "0");

    LocalReport localReport = new LocalReport(path);
    LocalReport localReportSub = new LocalReport(pathSub);

    localReport.AddDataSource("DataSetContact", dtArray[0]);
    localReportSub.AddDataSource("DataSetSub", dtArray[1]);
    //localReport.AddDataSource("DataSetContact", dtArray);


    dt = dtArray[0];
    dtSub = dtArray[1];
    var result = localReport.Execute(RenderType.Pdf, extension, parameters, mimetype);
    //var result = localReportSub.Execute(RenderType.Pdf, extension, null, mimetype);

    return File(result.MainStream, "application/pdf");
}

public DataTable[] GetEmployeeList()
{
    var dt = new DataTable();
    DataTable[] dtArray = new DataTable[2];
    dtArray[0] = new DataTable("DataTable0");
    dtArray[1] = new DataTable("DataTable1");

    dtArray[0].Columns.Add("EmpId", typeof(Int32));
    dtArray[0].Columns.Add("EmpName");
    dtArray[0].Columns.Add("EmpDepart");
    dtArray[0].Columns.Add("EmpDesignation");

    dtArray[1].Columns.Add("EmpContId", typeof(Int32));
    dtArray[1].Columns.Add("EmpId", typeof(Int32));
    dtArray[1].Columns.Add("EmpContMobile");
    dtArray[1].Columns.Add("EmpContEmail");
    dtArray[1].Columns.Add("EmpContAddress");
    dtArray[1].Columns.Add("EmpContCity");

    DataRow row;
    DataRow rowTwo;

    for (int i = 0;i < 10; i++)
    {
        row = dtArray[0].NewRow();
        row["EmpId"]=i;
        row["EmpName"]= "Taha Suliman Ramadan" + i.ToString();
        row["EmpDepart"]= "Accounting DeprtMemt" + i.ToString();
        row["EmpDesignation"]= "SoftWare Engineer" + i.ToString();
        dtArray[0].Rows.Add(row);
        //------------------------------
        for (int j = 0; j < 5; j++)
        {
            int x = i * 5 + j;
            rowTwo = dtArray[1].NewRow();
            rowTwo["EmpContId"] = x;
            rowTwo["EmpId"] = i;
            rowTwo["EmpContMobile"] = "00971523215230";
            rowTwo["EmpContEmail"] = "[e-mail]" + j.ToString();
            rowTwo["EmpContAddress"] = "Sharjah Gasimiya Mahata" + j.ToString();
            rowTwo["EmpContCity"] = "United Emarate Sharjah" + j.ToString();
            dtArray[1].Rows.Add(rowTwo);
        }

    }
    return dtArray;
}