call object from EXcel file witout opening the file

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C#

VB

my code is

Dim oApp As New Excel.Application()
        Dim wb As Excel.Workbook
        Dim oldCI As System.Globalization.CultureInfo = System.Threading.Thread.CurrentThread.CurrentCulture
        System.Threading.Thread.CurrentThread.CurrentCulture = New System.Globalization.CultureInfo("en-US")
        wb = oApp.Workbooks.Open("D:\NoriaMail\23120011\LPO Summary per Month_View 3 - All Months.xlsx")
        'oApp.Workbooks.
        System.Threading.Thread.CurrentThread.CurrentCulture = oldCI
        oApp.Visible = False
        Dim cmdText As String
        Dim cmdType
        Dim connStr
        cmdText = wb.Connections.Item(1).OLEDBConnection.CommandText
        cmdType = wb.Connections.Item(1).OLEDBConnection.CommandType
        wb.Connections.Item(1).Delete()
        connStr = "OLEDB;Provider=SQLOLEDB.1;" & _
                        "Password=sa;" & _
                        "Persist Security Info=True;" & _
                        "User ID=sa;" & _
                        "Initial Catalog=Northwind;Data Source=."
        wb.Connections.Add("NORIA", "", connStr, cmdText, 2)
        wb.RefreshAll()
        'wb.Close(False)
        wb = Nothing
        oApp = Nothing
        ' oApp.Quit()
        GC.Collect()
        'wb.Close(True, "D:\NoriaMail\23120011\LPO Summary per Month_View 3 - All Months.xlsx", False)
        'oApp.Visible = False
        WebBrowser1.Navigate("D:\NoriaMail\23120011\LPO Summary per Month_View 3 - All Months.xlsx")
        'oApp.Visible = False
    End Sub

//I have three problems
1-I want to change
wb = oApp.Workbooks.Open("D:\NoriaMail\23120011\LPO Summary per Month_View 3 - All Months.xlsx")
with another method to initialize wb without open the excel file
2-how can I close the file with saving my configuration but without let the excel file to ask me if I want to save my change.
3-realize wb from the memory and all thing connection with it.
please any help