Compact & repair works from msaccess app, but not from VB.NET

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VB

I've been facing issues with Compact & Repair being called from vb.NEt application.
No errors reported, but it doesn't fix the problem.
Whereas if I open the same mdb file in MSAccess and repair it, it works!

What I have tried:

Below is the code I tried:

Method1:
 Dim JRO As New JRO.JetEngine

                JRO.CompactDatabase("Provider=Microsoft.Jet.OLEDB.4.0;" & "Data Source= " & "C:\tempDB.mdb",
            "Provider=Microsoft.Jet.OLEDB.4.0;" & "Data Source=" & mdwfilename & ";Jet OLEDB:Engine Type=5")

Method2:
Dim app As New Microsoft.Office.Interop.Access.Application

Dim tempFile As String = "C:\tempDB.mdb"
app.CompactRepair(mdwfilename, tempFile, False)
app.Visible = False

Dim temp As FileInfo = New FileInfo(tempFile)
temp.CopyTo(mdwfilename, True)
temp.Delete()