vb.net, sql, IE, Cannot refer to an instance member of a class from within a shared method or shared member initializer without and explicit instance of the class, When I remove shared I get this err

I am very new at this so please keep the answer/ideas simple if possible.  Don't know if this question is Extremely difficult because almost eveything is Extremely difficult to me right now even the simple things. Thanks in advance!

I am making a web service with multi web referances. I had a common.vb with functions I removed most of the functions to a CommonTime.vb and made it a web references. My service to hits the common for the database functions only.

In my common.vb If
I keep the Shared in the function I get an error on CommonTimeWebRef
I remove Shared I get an error in my CustServDAL.vb

Public Shared Function GetROSSProduction(ByVal StartDate As DateTime, ByVal EndDate As DateTime, ByVal RowID As Integer) As DataSet
        ' This function is used to query all ROSS data for this web service
        ' RowID = ID in database

        StartDate = CommonTimeWebRef.EasternToCentral(StartDate)
        EndDate = EasternToCentral(EndDate)

        Dim strSQL As String = GetROSSSQLCommand(RowID)
        If strSQL = "Error" Then
            Return Nothing

        End If

        strSQL = Replace(strSQL, "&PARAM1", StartDate)
        strSQL = Replace(strSQL, "&PARAM2", EndDate)

        Try

            Dim DSProd As DataSet
            Dim db As OracleDatabase = DatabaseFactory.CreateDatabase("ROSS")
            Dim sqlCommand As String = strSQL

            Dim dbCommand As OracleClient.OracleCommand = db.GetSqlStringCommand(sqlCommand)
            DSProd = db.ExecuteDataSet(dbCommand)

            Return DSProd

        Catch ex As System.Exception
            LogErrorToDB("ProdLibWS.GetROSSProduction", ex, "App_Code/Common #24 (GetROSSProduction) - " & AppSettings("Server"))

            Return Nothing

        End Try

    End Function
 

CustServDAL.vb on GetROSSProduction
CODE

Public Function GetShippingSawPG(ByVal StartDate As DateTime, ByVal EndDate As DateTime) As DataSet

        Try

            Dim dsProd As Object = GetROSSProduction(StartDate, EndDate, 2)
            If Not dsProd Is Nothing Then Return dsProd Else Return Nothing

        Catch ex As Exception
            WebRefError.LogErrorToDB("ProdLibWS", "Error is in GetShippingSawPG Function: " & ex.Message, "Location CustSerDAL Function #68", "1", "dsProd", "Function", "GetShippingSawPG: " & ex.Source, ex.StackTrace)

            Return Nothing

        End Try

    End Function

I am pretty sure I need the CommonTimeWebRef.EasternToCentral(StartDate)in the Public Shared Function GetROSSProduction to hit my web service other wise it just keeps hitting the EasternCentral that is in the Common.vb