How to add subreport in crystal reports

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I have added subreport in crystal report design..Also In code behind file I have added code to open subreport...But when I run my application,it gives me null reference exception at the below line:
"Report.OpenSubreport("SubReport1").SetDataSource(dsNowMST)"

Below is a part of code to add subreport:

VB

Dim dsNowMST As New dsNowMST()
                da = New Odbc.OdbcDataAdapter(BDRSql, Con)
                da.Fill(dsNowMST, "commNowMst")


                Report.OpenSubreport("SubReport1").SetDataSource(dsNowMST)

Can any1 please help me..this is the first time I am working with sub reports...

Posted 8-Mar-13 19:10pm

Rachna0309

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*Karthik Harve* · Answer 1 · 2013-03-08T19:32:00

Hi,

try like below.

VB

Dim subreportName As String
Dim subreportObject As SubreportObject
Dim subreport As New ReportDocument()

If TypeOf (Report.ReportDefinition.ReportObjects. _
    Item("SubReport1")) Is SubreportObject Then
    subreportObject = Report.ReportDefinition.ReportObjects. _
        Item("SubReport1")
    subreportName = subreportObject.SubreportName
    subreport = Report.OpenSubreport(subreportName)
    
    Dim dsNowMST As New dsNowMST()
    da = New Odbc.OdbcDataAdapter(BDRSql, Con)
    da.Fill(dsNowMST, "commNowMst") 
    
    subreport.SetDataSource(dsNowMST)
End If

refer MSDN[^]

hope it works.