Duplicate Settings In Reference DLL - vb.net

Question

I have a DLL with several properties and a function that generates runs a SSRS report in the background and saves it to a PDF file.
I have a DataTable with all the reports that need to be generated and where they need to be saved.
I want to make each instance of the DLL run in a separate thread. I took a stab at it found the 2nd row in the DataTable overrode the first row.
Here is the Class/DLL Code
Public Class SSRSFunctions
Private Shared _Formated_Parameters As String
Private Shared _Report_Parameters As Dictionary(Of String, String)
Public Property FORMATED_PARAMETERS() As String
Get
Return _Formated_Parameters
End Get
Set(ByVal value As String)
_Formated_Parameters = value
End Set
End Property
Public Sub New()
_Report_Parameters = New Dictionary(Of String, String)
End Sub
Public Function RenderReportToFile() As String
'RenderReportHere
End Function
Public Sub AddParameter(ByVal Name As String, ByVal Value As String)
If _Report_Parameters.ContainsKey(Name) Then
_Report_Parameters.Remove(Name)
_Report_Parameters.Add(Name, Value)
Else
_Report_Parameters.Add(Name, Value)
End If
End Sub
End Class
Here is the calling Code
Private Sub CheckForNewRequests()
'Filter DataTable for Reports to Run
For Each dr As DataRow in DateTable.Rows
Dim rpt As New SSRSFunctions
Dim t1 As New Threading.Thread(AddressOf StartNewThread)
rpt.FORMATED_PARAMETERS = (dr("REPORT_PARAMS"))
t1.Start(rpt)
Next
End Sub
Private Function StartNewThread(ByVal report As SSRSFunctions) As String
Return report.RenderReportToFile()
End Function
I am trying to figure out why the "Dim rpt As New SSRSFunctions" is not creating a new instance of the DLL and so the second row of the dataTable has a new instance to store it's parameters.
The second row is overriding the first.
Help?
Thanks
jlimited

Answer 1

Dont make the private properties shared, remove the Shared keyword from the declarations.
change
Private Shared _Formated_Parameters As String
Private Shared _Report_Parameters As Dictionary(Of String, String)
to
Private _Formated_Parameters As String
Private _Report_Parameters As Dictionary(Of String, String)
By sharing them you are saying that no matter how many instances of the class is created always use (share) the same instance of the shared internal variable.