Create Parameter and set Parameter properties using API

Question

I want to create a parameter with RAS API.
Here I want to create a string parameter and initialize it and set the values.
This is the code I use to create a parameter.
I use here the RAS API, because I want to create a parameter
        Dim myParameterField As New CrystalDecisions.ReportAppServer.DataDefModel.ParameterField
        myParameterField.ParameterType = CrParameterFieldTypeEnum.crParameterFieldTypeReportParameter
        myParameterField.ValueRangeKind = CrParameterValueRangeKindEnum.crParameterValueRangeKindDiscrete
        myParameterField.Type = CrFieldValueTypeEnum.crFieldValueTypeStringField
        myParameterField.Name = "mystring"
        m_RasDoc.DataDefController.ParameterFieldController.Add(myParameterField)
later, I call the following code to set the values of the parameter "mystring".
I use DOTNET-SDK, because I dont know how to do this with the RAS API
        Dim crParameterDiscreteValue As ParameterDiscreteValue
        Dim crParameterFieldDefinitions As ParameterFieldDefinitions
        Dim crParameterFieldLocation As ParameterFieldDefinition
        Dim crParameterValues As ParameterValues
        crParameterFieldDefinitions = m_crNetDoc.DataDefinition.ParameterFields
        crParameterFieldLocation = crParameterFieldDefinitions.Item("mystring")
        crParameterValues = crParameterFieldLocation.CurrentValues
        crParameterDiscreteValue = New CrystalDecisions.Shared.ParameterDiscreteValue
        crParameterDiscreteValue.Value = "myvalue"
        crParameterValues.Add(crParameterDiscreteValue)
        crParameterFieldLocation.ApplyCurrentValues(crParameterValues)
        crParameterFieldLocation.ApplyDefaultValues(crParameterValues)
        crParameterFieldLocation.IsOptionalPrompt = False
later, I save this report to disk.
When I open the generated report in the Crystal Designer, there are no default values for this created parameter 'mystring'.
Is it possible to set DefaultValues using RAS API?
Can I populate the combobox for a parameter in parameter Dialog? Can I set the standard value field?
Thank you
Otto

Answer 1

Hello,
at first i want to create a new parameter. Then set the parameter value in the parameterlist and store a standard default value.
I want if this stored report will be opened with the Crystal Reports Designer and I start with the view button, the default values should be set in the parameter text field, so that the user must not type in the parameter values.
Please help me!
Thank to all helpers.