چگونگی بارگذاری و نمایش Crystal Reports در VB.NET

Dim objForm As New frmViewReport
objForm.ViewReport("C:\test.rtp", , "@parameter1=test�mter2=10")
objForm.show()

<First Parameter Name>=<First Paramter Value>&
<Second Parameter Name>=<Second Paramter Value>..

Friend Function ViewReport(ByVal sReportName As String, _
    Optional ByVal sSelectionFormula As String = "", _
    Optional ByVal param As String = "") As Boolean

    'Declaring variablesables
    Dim intCounter As Integer
    Dim intCounter1 As Integer

    'Crystal Report's report document object
    Dim objReport As New _
        CrystalDecisions.CrystalReports.Engine.ReportDocument 

    'object of table Log on info of Crystal report
    Dim ConInfo As New CrystalDecisions.Shared.TableLogOnInfo

    'Parameter value object of crystal report 
    ' parameters used for adding the value to parameter.
    Dim paraValue As New CrystalDecisions.Shared.ParameterDiscreteValue

    'Current parameter value object(collection) of crystal report parameters.
    Dim currValue As CrystalDecisions.Shared.ParameterValues

    'Sub report object of crystal report.
    Dim mySubReportObject As _
        CrystalDecisions.CrystalReports.Engine.SubreportObject

    'Sub report document of crystal report.
    Dim mySubRepDoc As New _
        CrystalDecisions.CrystalReports.Engine.ReportDocument

    Dim strParValPair() As String
    Dim strVal() As String
    Dim index As Integer

    Try

        'Load the report
        objReport.Load(sReportName)

        'Check if there are parameters or not in report.
        intCounter = objReport.DataDefinition.ParameterFields.Count

        'As parameter fields collection also picks the selection 
        ' formula which is not the parameter
        ' so if total parameter count is 1 then we check whether 
        ' its a parameter or selection formula.

        If intCounter = 1 Then
            If InStr(objReport.DataDefinition.ParameterFields(_
                0).ParameterFieldName, ".", CompareMethod.Text) > 0 Then
                intCounter = 0
            End If    
        End If

        'If there are parameters in report and 
        'user has passed them then split the 
        'parameter string and Apply the values 
        'to their concurrent parameters.

        If intCounter > 0 And Trim(param) <> "" Then
            strParValPair = param.Split("&")

            For index = 0 To UBound(strParValPair)
            If InStr(strParValPair(index), "=") > 0 Then
                strVal = strParValPair(index).Split("=")
                paraValue.Value = strVal(1)
                currValue = _ 
                    objReport.DataDefinition.ParameterFields(_
                    strVal(0)).CurrentValues
                currValue.Add(paraValue)
                objReport.DataDefinition.ParameterFields(_
                    strVal(0)).ApplyCurrentValues(currValue)
            End If
        Next
    End If

    'Set the connection information to ConInfo 
    'object so that we can apply the 
    'connection information on each table in the report
    ConInfo.ConnectionInfo.UserID = <User Name>
    ConInfo.ConnectionInfo.Password = <Password>
    ConInfo.ConnectionInfo.ServerName = <Server Name>
    ConInfo.ConnectionInfo.DatabaseName = <Database Name>

    For intCounter = 0 To objReport.Database.Tables.Count - 1
        objReport.Database.Tables(intCounter).ApplyLogOnInfo(ConInfo)
    Next

    ' Loop through each section on the report then look 
    ' through each object in the section
    ' if the object is a subreport, then apply logon info 
    ' on each table of that sub report

        For index = 0 To objReport.ReportDefinition.Sections.Count - 1
            For intCounter = 0 To _
                objReport.ReportDefinition.Sections(_
                index).ReportObjects.Count - 1
            With objReport.ReportDefinition.Sections(index)
                If .ReportObjects(intCounter).Kind = _
                CrystalDecisions.Shared.ReportObjectKind.SubreportObject Then
                    mySubReportObject = CType(.ReportObjects(intCounter), _
                      CrystalDecisions.CrystalReports.Engine.SubreportObject)
                    mySubRepDoc = _ 
             mySubReportObject.OpenSubreport(mySubReportObject.SubreportName)
                 For intCounter1 = 0 To mySubRepDoc.Database.Tables.Count - 1
                       mySubRepDoc.Database.Tables(_
                           intCounter1).ApplyLogOnInfo(_
                           ConInfo)sp;
                       mySubRepDoc.Database.Tables(_
                           intCounter1).ApplyLogOnInfo(ConInfo)
                 Next
                 End If
             End With
         Next
     Next
    'If there is a selection formula passed to this function then use that
    If sSelectionFormula.Length > 0 Then
        objReport.RecordSelectionFormula = sSelectionFormula
    End If
    'Re setting control 
    rptViewer.ReportSource = Nothing

    'Set the current report object to report.
    rptViewer.ReportSource = objReport

    'Show the report
    rptViewer.Show()
        Return True
    Catch ex As System.Exception
        MsgBox(ex.Message)
    End Try
End Function