[GIS] Remove Shapefile lock

Question

I have an ArcObject Dissolve procedure that creates a shp in a directory. This dissolved layer is a temp layer and is not added into ArcMap. I would like to delete it when the user clicks a button again, however it will not delete because their is a lock file (Dissolved.shp.6H8Z5D1.3448.1520.sr.lock) in the directory that happens after the dissolve gp runs:

pSumTable = pGeoProc.Dissolve(pInputTable, True, "ROUTE", "Dissolve.Shape, Minimum.ROUTE", pdatasetname2)

I looked at Using Scheme Locks, however I'm not using this layer to perform any edits. I also found this post on GIS SE, however it too does not seem to apply for my situation. How do I remove this sr lock file (my entire code below), while keeping the ArcMap session open?

Thanks

 Try

            'delete all temp files
            Dim s As String
            For Each s In System.IO.Directory.GetFiles("J:\20111030\GIS\Scripts\TempData2")
                System.IO.File.Delete(s)
            Next s

            'dissolve route layer
            Dim pMap As IMap

            pMap = mxdoc.FocusMap

            Dim pInputFeatLayer As IFeatureLayer

            pInputFeatLayer = featurelayer

            If pInputFeatLayer Is Nothing Then

                MessageBox.Show("The testinline layer was not found")
                Exit Sub

            End If

            Dim pInputTable As ITable
            pInputTable = pInputFeatLayer

            If pInputTable Is Nothing Then

                MsgBox("Table QI failed")
                Exit Sub

            End If

            If pInputTable.FindField("ROUTE") = -1 Then

                MsgBox("There must be a field named MUSYM layer ")
                Exit Sub

            End If

            Dim pInputFeatClass As IFeatureClass
            pInputFeatClass = featurelayer.FeatureClass

            Dim pfeatureclassname As IFeatureClassName
            pfeatureclassname = New FeatureClassName

            With pfeatureclassname

                .FeatureType = esriFeatureType.esriFTSimple
                .ShapeFieldName = "Shape"
                .ShapeType = pInputFeatClass.ShapeType

            End With

            Dim pNewWSName As IWorkspaceName
            pNewWSName = New WorkspaceName

            pNewWSName.WorkspaceFactoryProgID = "esriCore.ShapefileWorkspaceFactory.1"
            pNewWSName.PathName = "J:\20111030\GIS\Scripts\TempData2\"

            Dim pdatasetname2 As IDatasetName

            pdatasetname2 = pfeatureclassname
            pdatasetname2.Name = "Dissolved"

            pdatasetname2.WorkspaceName = pNewWSName

            Dim pGeoProc As IBasicGeoprocessor
            Dim pSumTable As ITable
            pGeoProc = New BasicGeoprocessor
            pSumTable = pGeoProc.Dissolve(pInputTable, True, "ROUTE", "Dissolve.Shape, Minimum.ROUTE", pdatasetname2)
            Dim pOutputFeatClass As IFeatureClass
            pOutputFeatClass = pSumTable

            If pOutputFeatClass Is Nothing Then
                MsgBox("FeaturesClass QI Failed")
                Exit Sub
            End If

            Dim pOutputFeatLayer As IFeatureLayer
            pOutputFeatLayer = New FeatureLayer
            pOutputFeatLayer.FeatureClass = pOutputFeatClass
            pOutputFeatLayer.Name = pOutputFeatClass.AliasName

            ' CLEAN UP
            featurelayer = Nothing
            pInputFeatLayer = Nothing
            pInputTable = Nothing
            pInputFeatClass = Nothing
            pfeatureclassname = Nothing
            pNewWSName = Nothing
            pdatasetname2 = Nothing
            pGeoProc = Nothing
            pSumTable = Nothing
            pOutputFeatClass = Nothing
            pOutputFeatLayer = Nothing

            pMap = Nothing
            mxdoc = Nothing

        Catch ex As Exception
            MessageBox.Show("Caught an unspecified error in the calling code: " & vbCrLf & ex.ToString)
        End Try

Answer 1

Use System.Runtime.InteropServices.Marshal::ReleaseComObject to destroy the ArcObjects before you disassociate their reference.