Displaying , Exporting and Printing Crystal Reports in ASP.NET

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Introduction

The main purpose of this document is to display the report without any error. I was bugged by the "Logon Failed Error" for several days, and now I finally have a code that displays report without any error. The code also Exports the report into .pdf, .xls, .rtf and .doc formats. It also prints the report directly to the printer.

Using the code

Unzip the crCodes.Zip and then run the crCode.vbproj project file.

--- OR ----

Just insert the Webform1.aspx file into your existing project, then copy the crystalreport2.rpt file into your project, and start using the code.

The entire source code of Webform1.aspx.vb is as follows. Simply design the form as shown in the image and place the Crystal Report Viewer control, and leave the name of controls to default:

Imports CrystalDecisions.Shared
Imports System.IO

Public Class WebForm1
    Inherits System.Web.UI.Page

    Dim crReportDocument As CrystalReport2 = New CrystalReport2

    Protected WithEvents DropDownList1 As System.Web.UI.WebControls.DropDownList
    Protected WithEvents Button1 As System.Web.UI.WebControls.Button
    Protected WithEvents Label1 As System.Web.UI.WebControls.Label
    Protected WithEvents CrystalReportViewer1 As _
                             CrystalDecisions.Web.CrystalReportViewer
    Protected WithEvents Button2 As System.Web.UI.WebControls.Button

#Region " Web Form Designer Generated Code "
    'This call is required by the Web Form Designer.

    <System.Diagnostics.DebuggerStepThrough()> 
    Private Sub InitializeComponent()

    End Sub

    'NOTE: The following placeholder declaration is required 

    'by the Web Form Designer.

    'Do not delete or move it.

    Private designerPlaceholderDeclaration As System.Object

    Private Sub Page_Init(ByVal sender As System.Object,_ 
                        ByVal e As System.EventArgs) Handles MyBase.Init
        'CODEGEN: This method call is required by the Web Form Designer

        'Do not modify it using the code editor.

        InitializeComponent()


        ' this is the most IMPORTANT line of code

        ' if this line is not writen the 

        ' " LOGON FAILED" error starts displaying

        crReportDocument.SetDatabaseLogon("username",_ 
                                    "password", "sql-server", "database")

        ' the Above line works even if only username 

        ' and password is supplied as below


        'crReportDocument.SetDatabaseLogon("username",_

                                 "password") ', "sql-server", "database")


        ' this will hide the group tree

        CrystalReportViewer1.DisplayGroupTree = False

        CrystalReportViewer1.ReportSource = crReportDocument

        ' IF REPORT Uses Parameter's

        ' Pass Paramaters As Follows

        crReportDocument.SetParameterValue("city", "Mumbai")


        ' city = Parameter Name

        ' Mumbai = Parameter Value


        ' :-) thats ALL your Report Will Be displayed 

        ' now Without Logon Failed Error


        With DropDownList1.Items
            .Add("Rich Text (RTF)")
            .Add("Portable Document (PDF)")
            .Add("MS Word (DOC)")
            .Add("MS Excel (XLS)")
        End With
    End Sub

#End Region

    Private Sub Page_Load(ByVal sender As System.Object,_ 
                ByVal e As System.EventArgs) Handles MyBase.Load
        'Put user code to initialize the page here

    End Sub

    Sub ExportReport()

        Dim oStream As New MemoryStream ' // using System.IO


        'this contains the value of the selected export format.

        Select Case DropDownList1.SelectedItem.Text 

            Case "Rich Text (RTF)"
                '-----------------------------------------------------------


                oStream = crReportDocument.ExportToStream(_
                    CrystalDecisions.Shared.ExportFormatType.WordForWindows)
                Response.Clear()
                Response.Buffer = True
                Response.ContentType = "application/rtf"
                '------------------------------------------------------------


                '------------------------------------------------------------

            Case "Portable Document (PDF)"

                oStream = crReportDocument.ExportToStream(_
                    CrystalDecisions.Shared.ExportFormatType.PortableDocFormat)
                Response.Clear()
                Response.Buffer = True
                Response.ContentType = "application/pdf"
                '--------------------------------------------------------------


                '--------------------------------------------------------------

            Case "MS Word (DOC)"

                oStream = crReportDocument.ExportToStream(_
                        CrystalDecisions.Shared.ExportFormatType.WordForWindows)
                Response.Clear()
                Response.Buffer = True
                Response.ContentType = "application/doc"
                '---------------------------------------------------------------


                '---------------------------------------------------------------

            Case "MS Excel (XLS)"

                oStream = crReportDocument.ExportToStream(_
                                 CrystalDecisions.Shared.ExportFormatType.Excel)
                Response.Clear()
                Response.Buffer = True
                Response.ContentType = "application/vnd.ms-excel"
                '---------------------------------------------------------------

        End Select 'export format

        Try
            Response.BinaryWrite(oStream.ToArray())
            Response.End()
        Catch err As Exception
            Response.Write("< BR >")
            Response.Write(err.Message.ToString)
        End Try
    End Sub

    Private Sub Button2_Click(ByVal sender As System.Object, _
                          ByVal e As System.EventArgs) Handles Button2.Click
        ExportReport()
    End Sub

    Private Sub Button1_Click(ByVal sender As System.Object, _
                          ByVal e As System.EventArgs) Handles Button1.Click
        crReportDocument.SetDatabaseLogon("USER", _
                                "PASSWORD", "SQL-SERVER", "DATABASE")
        crReportDocument.PrintToPrinter(1, False, 0, 0)
    End Sub
End Class

Why is the "Logon Failed Error" generated

The "Logon Failed" error is generated basically because, when the report is being displayed it tries to log on to the database server. Even though you have selected the server while designing, the report still needs the server name while displaying or exporting or printing.

The code line that removes the error is:

crReportDocument.SetDatabaseLogon("USER", "PASSWORD", "SQL-SERVER", "DATABASE")

Or can also be used as:

crReportDocument.SetDatabaseLogon("USER", "PASSWORD")