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From: Rupinder on 8 Nov 2009 22:25
HI All,

I am trying to use a reportviewer control on my Web page to display some
reports. I wanted to use the same control to display more than one reports.

But when I have a preSelected report every thing works fine. but when I
change the report path programmatically I am getting this error.

"A data source instance has not been supplied for the data source
'myreport1'"

where myreport1 is the Dataset name I have used in my report.

Looks like the code is able to read my report but the datasource is not set
for the report properly.

Please help.

thanks,
Rupinder


Here is the code I am using.

Protected Sub Page_Load(ByVal sender As Object, ByVal e As System.EventArgs)
Handles Me.Load
'the objectDataSource1 is the control on my page.
ObjectDataSource1.TypeName = "MyDataSource"
ObjectDataSource1.SelectMethod = "GetMyData"

If Request.QueryString("Report") = "report1" Then
ObjectDataSource1.SelectParameters.Add("spname", "rpt_sp1")
ObjectDataSource1.SelectParameters.Add("rname", "1")
Me.ReportViewer1.ProcessingMode = ProcessingMode.Local
Me.ReportViewer1.LocalReport.DataSources.Add(New
ReportDataSource("MyDS", ObjectDataSource1))
Me.ReportViewer1.LocalReport.ReportPath = "report1.rdlc"

Else
ObjectDataSource1.SelectParameters.Add("spname", "rpt_sp2")
ObjectDataSource1.SelectParameters.Add("rname", "2")
Me.ReportViewer1.LocalReport.EnableHyperlinks = True
Me.ReportViewer1.ProcessingMode = ProcessingMode.Local
Me.ReportViewer1.LocalReport.ReportPath = "report2.rdlc"
Me.ReportViewer1.LocalReport.DataSources.Add(New
ReportDataSource("MyDS", ObjectDataSource1))
End If
End Sub


The code of the MYDataSource class is as follows

Public Class MyDataSource
Public Function GetMyData(ByVal spname As String, ByVal rname As String)
As DataTable
Dim ds As New DataSet()
ds.DataSetName = "MyDS"
Dim con As String
If rname = "1" Then
con =
ConfigurationManager.ConnectionStrings("Report1ConnectionString").ConnectionString
Else
con =
ConfigurationManager.ConnectionStrings("Report2ConnectionString").ConnectionString
End If
Dim com As New SqlCommand()
com.Connection = New SqlConnection(con)
com.Connection.Open()
Dim dp As New SqlDataAdapter(spname, con)
dp.Fill(ds, "MyTable")
Return (ds.Tables(0))
End Function
End Class

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