I want to initialize some values in web service method that will be used in every web method

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WCF

I want to initialize some values(variables) in web service method that will be used in every web method,without using session var (httpContext)

i guess variables will lose its values , in every method

<ServiceContract(Namespace:="")>
<AspNetCompatibilityRequirements(RequirementsMode:=AspNetCompatibilityRequirementsMode.Allowed)>
Public Class Service

    Dim a As Integer
    dim b As Integer
    <OperationContract>
    Public Function init2(ByVal a1 As Integer, ByVal b1 As Integer) As Integer
        a = a1
        b = b1
        
        Return a1 + b1
    End Function

    <OperationContract()>
    Public Function DoValue() As Integer
        Return  a+ b    End Function

End Class