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How to Create a Crystal Reports from sql query string in vb.net

Posted on 2009-05-14
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Last Modified: 2012-05-07
I tried to create a crystal report according to the user choice in a vb form. For that i like to pass a dynamically generated query
to crystal report. But when im assigning the "SetDataSource" property of CR by the following coding its giving the error
 
"Object reference not set to an instance of an object ." ....

i used the following coding...




help me...

Thanks in advance
Public Class Form1
    Dim rpt As CrystalReport1
 
    Private Sub Button1_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles Button1.Click
        Dim cnn As OleDbConnection
 
     
        cnn = New OleDbConnection("Provider=Microsoft.Jet.OLEDB.4.0;Data Source=E:\ELA\Current\Tailor_Software\TailorDb.mdb")
        cnn.Open()
       
        Dim da As New OleDbDataAdapter("select * from User_Master", cnn)
        Dim ds As New DataSet
        da.Fill(ds, "User_Master")
 
         rpt.SetDataSource(ds.Tables(1))    'I am having the error at here
 
        CrystalReportViewer1.ReportSource = rpt
        CrystalReportViewer1.Refresh()
    End Sub
End Class

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Question by:kamikazis
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7 Comments
 
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Accepted Solution

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Éric Moreau earned 50 total points
ID: 24383213
you normally provide the full dataset to a report, not just a table.

also, the table collections is 0-based. so if you want to access the first table, you need to provide the index 0 (ds.tables(0))

Finally, have a look at http://www.emoreau.com/Entries/Articles/2006/09/Feeding-Crystal-Reports-from-your-application.aspx
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Author Comment

by:kamikazis
ID: 24394107
hi emoreau, ur page is very useful... Now i overcame this error...Now its executing correctly...But i want to display a crystal report as user desire by giving his choices in a vb form....I want to learn about grouping also..i tried gouping but nothing comes in CR...  Plz help me  Eric....
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Expert Comment

by:Éric Moreau
ID: 24394168
>>But i want to display a crystal report as user desire by giving his choices in a vb form

I have explained that in my article. See the "Passing a value to a parameter of the report" section.

For grouping, have a look at http://www.businessobjects.com/global/pdf/dev_zone/VS2005_Walkthroughs.pdf
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Expert Comment

by:mlmcc
ID: 24395005
What user choices?  What will the choices do?

mlmcc
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Expert Comment

by:Éric Moreau
ID: 25447831
I think I put kamikazis on the right track
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