Top N Reports from .net 2008

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CrystalReports

I have created a Top N crystal reports with Crystal XI. Created a group which will be used for Top N summary. Then I created a parameter which I assigned it in Top N group sort expert.
The problem is The report works perfectly when I change parameter value in .rpt file. But when I pass parameters from .net 2008 it takes default value of the parameter.

What could be wrong?
Can anyone suggest?

Shailesh

Here is the code I use to set the paramaters:

Dim crParameterFieldDefinitions As CrystalDecisions.CrystalReports.Engine.ParameterFieldDefinitions
Dim crParameterFieldDefinition As CrystalDecisions.CrystalReports.Engine.ParameterFieldDefinition
Dim crParameterValues As New CrystalDecisions.Shared.ParameterValues
Dim crParameterDiscreteValue As New CrystalDecisions.Shared.ParameterDiscreteValue

crParameterDiscreteValue.Value = Value
crParameterFieldDefinitions = objReport.DataDefinition.ParameterFields
crParameterFieldDefinition = crParameterFieldDefinitions.Item("BottomN")
crParameterValues = crParameterFieldDefinition.CurrentValues

crParameterValues.Clear()
crParameterValues.Add(crParameterDiscreteValue)
crParameterFieldDefinition.ApplyCurrentValues(crParameterValues)

[Edit - Transferred code from solution to the question, and added code block.]