Crystal Report - Values Repeating In Detail Section

Crystal Report is repeating values like this:
1 rar
1 rar
1 rar
1 rar
1 rar

I want the output to be like this:
1 rar

I wrote code like this:
Dim crParameterFieldDefinitions As ParameterFieldDefinitions
Dim crParameterFieldDefinition As ParameterFieldDefinition
Dim crParameterValues As New ParameterValues()
Dim crParameterDiscreteValue As New ParameterDiscreteValue()
crParameterDiscreteValue.Value = Label1.Text
[Code] ......