Hi

I'm completing a tutorial recommended by another user.
I have entered the following code in my project:

Imports CrystalDecisions.CrystalReports.Engine
Imports CrystalDecisions.Shared
Imports System.Collections

Public Class Form1
    Private customersByCityReport As CustomerByCity
    Private Const PARAMETER_FIELD_NAME As String = "City"
  

    Private Sub Form1_Load(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles MyBase.Load
        ConfigureCrystalReports()
    End Sub

    Private Sub ConfigureCrystalReports()
        Dim myArrayList As ArrayList = New ArrayList()
        myArrayList.Add("Paris")
        myArrayList.Add("Tokyo")
        SetCurrentValuesForParameterField(customersByCityReport, myArrayList)
        customersByCityReport = New CustomerByCity
        myCrystalReportViewer.ReportSource = customersByCityReport
    End Sub

    Private Sub SetCurrentValuesForParameterField(ByVal myReportDocument As ReportDocument, ByVal myArrayList As ArrayList)
        Dim currentParameterValues As ParameterValues = New ParameterValues()
       
        For Each submittedValue As Object In myArrayList
            Dim myParameterDiscreteValue As ParameterDiscreteValue = New ParameterDiscreteValue()
            myParameterDiscreteValue.Value = submittedValue.ToString()
            currentParameterValues.Add(myParameterDiscreteValue)
        Next
        Dim myParameterFieldDefinitions As ParameterFieldDefinitions = myReportDocument.DataDefinition.ParameterFields
        Dim myParameterFieldDefinition As ParameterFieldDefinition = myParameterFieldDefinitions(PARAMETER_FIELD_NAME)
        myParameterFieldDefinition.ApplyCurrentValues(currentParameterValues)
    End Sub


End Class

However, when I run the message the line in red causes the error message: object reference not set to instance of an object

Can anyone help?

Thanks

Hi Del

I tried doing that but got the following error message:

Value of type 'CrystalDecisions.Shared.ParameterFields' cannot be converted to 'CrystalDecisions.CrystalReports.Engine.ParameterFieldDefinitions'.