Cannot delete file in asp.net ?

Hi,

I deployed an application in  'A' server IIS. & I am trying to delete a file using application in the 'B' server.

But it's not deleting a file in 'B' server ..

lblCheckThis.Text = Session("AttachfilePath").ToString()
            If Session("AttachfilePath") IsNot Nothing And Session("AttachfilePath") <> "" Then
                If System.IO.File.Exists(Session("AttachfilePath")) And System.IO.Path.GetFullPath(Session("AttachfilePath")).ToString().Contains("HoldingBay") Then
                    lblCheckThis.Text = "Came inside"
                    System.IO.File.Delete(Session("AttachfilePath"))
                    Session("AttachfilePath") = Nothing
                Else
                    lblCheckThis.Text = "Not Came inside"
                End If
            End If

From localhost , system able to delete a file , but after I added in to IIS in 'A' server then it's not deleting in 'B' Server

I checked the path of a file like 'F:\HoldingBay\ITContract\Reddy\3)Emails Filed under Tasks Category.txt' , it's going inside IF condition from localhost and able to delete a file in 'B' server.

But It's not going to inside IF condition from 'A' server.

Please help me on this.. Thanks in advance..