Crystal Report on C# - crystal-reports

Question

Well I have a Cyrstal report which has 4 sub reports on and it is linked through an ItemID column and a Culture, so it has a parameter value "?Pm-ItemID" and "?Pm-Culture" now i'm using DataSet to load the data to the Crystal Report's datasource, when I run the report its giving me an error which was an asking parameter field was not suplied, so i think my question would be what am I going to pass to those ParameterFields?
here's an idea.
ReportDocument myreport = new ReportDocument();
myreport.Load("C:\MyReport.rpt");
DataSet ds = GenerateReportData();
myreport.SetDataSource(ds);
//Loop through each to Load the DataSet
for (int i = 0; i < myreport.Subreports.Count; i++)
{
ReportDocument subreport = myreport.SubReports[i];
DataSet subds = GenerateReportData(subreport.name)
subreport.SetDataSource(subds);
}
//I can see that there's a parameterfields in myreport.ParameterFields
//As I look through inside it there are 8 ParameterFields repeating Pm-ItemID and Pm-Culture
foreach (ParameterField pf in myreport.ParameterFields)
{
myreport.SetParameterValue(pf.Name, Value???);
}

Answer 1

Well, I see what's wrong.
ReportDocument subreport = myreport.SubReports[i];
DataSet subds = GenerateReportData(subreport.name)
subreport.SetDataSource(subds);
should not be done this way, it should be
DataSet subds = GenerateReportData(subreport.name)
myreport.SubReports[i].SetDataSource(subds);

Answer 2

I don't know about Crystal, but in SSRS it works like this:
1) create a subreport and create some parameters
2) create the main report, put there the subreport and in the properties you can specify what to bind to the subreport's parameters
Conclusion: I don't think this is supposed to be set in code, rather report designer.