Background Worker Not Clearing Resources - vb.net

Question

I'm currently working on an application that fetches some information from a database using a BW. It uses a stores number, referred to as IDP and searches the correct database. It works perfectly for my needs. However, each time it runs it's adding anywhere between 10-300 KBs to RAM, it is not releasing this memory once it completes. Since this code can be ran hundreds of times a day by numerous different people on a virtual machine with limited resources I really need it to release any memory it uses. Can anyone see where I'm going wrong?
Note: I'm self-taught and I'm doing this as more of a hobby that helps me out at work and not actually employed to do this, as I'm sure some of you will be happy to know once seeing my newbie code.
Public Sub KickoffStoreBrief() 'Called when txtIDP (text box) text changes
Dim args As BW_GetStoreBriefVariables = New BW_GetStoreBriefVariables()
args.Current_IDP = txtIDP.Text.Trim
If BW_GetStoreBrief.IsBusy Then
MsgBox("Worker busy!")
Else
BW_GetStoreBrief.RunWorkerAsync(args)
End If
End Sub
Private Sub BW_GetStoreBrief_DoWork(sender As Object, e As DoWorkEventArgs) Handles BW_GetStoreBrief.DoWork
Dim args As BW_GetStoreBriefVariables = DirectCast(e.Argument, BW_GetStoreBriefVariables) 'Convert the generic Object back into a MyParameters object
Using DatabaseConnection As New SqlConnection(args.ConnectionString)
Dim command As New SqlCommand(SQL CODE IS HERE, DatabaseConnection)
command.CommandTimeout = 20
'Attempt to open the connection
command.Connection.Open()
Dim reader As SqlDataReader = command.ExecuteReader()
Dim dt As New DataTable()
dt.Load(reader)
reader = Nothing
'Check if returned anything
If dt.Rows.Item(0).Item(0) = Nothing Or dt.Rows.Item(0).Item(0).ToString = "False" Or dt.Rows.Item(0).Item(0).ToString = "" Then
'Branch not found.
GoTo Ender
End If
'Prefix 0's infront of the IDP as required
Dim CompleteIDPNumber As String = ""
If dt.Rows.Item(0).Item(0).ToString.Length < 4 Then
If dt.Rows.Item(0).Item(0).ToString.Length = 2 Then
CompleteIDPNumber = "00" & dt.Rows.Item(0).Item(0).ToString
ElseIf dt.Rows.Item(0).Item(0).ToString.Length = 3 Then
CompleteIDPNumber = "0" & dt.Rows.Item(0).Item(0).ToString
Else
CompleteIDPNumber = dt.Rows.Item(0).Item(0).ToString
End If
Else
CompleteIDPNumber = dt.Rows.Item(0).Item(0).ToString
End If
'Populate strings
Dim StoreName As String = CompleteIDPNumber & " - " & dt.Rows.Item(0).Item(1).ToString.Trim
Dim UISupports As Integer = 20 'This is the amount of characters that will fit in label space
If StoreName.Length > UISupports Then
StoreName = StoreName.Substring(0, UISupports).ToString.Trim & "..." & " (" & dt.Rows.Item(0).Item(3).ToString.Trim & ")"
Else
StoreName = StoreName & " (" & dt.Rows.Item(0).Item(3).ToString.Trim & ")"
End If
args.Brief_StoreName = StoreName
StoreName = Nothing 'We no longer need this, release it from memory
UISupports = Nothing 'We no longer need this, release it from memory
CompleteIDPNumber = Nothing 'We no longer need this, release it from memory
If dt.Rows.Item(0).Item(2) = 0 Or dt.Rows.Item(0).Item(2).ToString.Trim = "0" Then
args.Brief_POSNumber = "IS"
Else
args.Brief_POSNumber = dt.Rows.Item(0).Item(2).ToString.Trim
End If
args.Brief_Category = dt.Rows.Item(0).Item(3).ToString 'CAT
args.Brief_STCamera = dt.Rows.Item(0).Item(4).ToString 'Counter
args.Brief_Franch = dt.Rows.Item(0).Item(5).ToString
Ender:
e.Result = args
'Close connection
dt.Dispose()
command.Connection.Close()
command.Dispose()
End Using
End Sub
Private Sub BW_GetStoreBrief_RunWorkerCompleted(sender As Object, e As RunWorkerCompletedEventArgs) Handles BW_GetStoreBrief.RunWorkerCompleted
If e.Error IsNot Nothing Then
ListBox1.Items.Insert(0, Now.ToString("HH:mm:ss") & " | Error | Unable to connect to store DB.")
lblNotFound.Text = "Unable to connect to database."
Panel_NotFound.Visible = True
Panel_NotFound.BringToFront()
ErrorLogger.LogError(System.Reflection.MethodBase.GetCurrentMethod().Name, e.Error.Message, 0)
ElseIf e.Cancelled Then
Else
' Access variables through args
Dim args As BW_GetStoreBriefVariables = DirectCast(e.Result, BW_GetStoreBriefVariables) 'Convert the generic Object back into a MyParameters object
If args.Brief_StoreName = "" Then
ListBox1.Items.Insert(0, Now.ToString("hh:mm:ss") & " | Notice | IDP " & args.Current_IDP & " not found in database.")
'show warning panel
lblNotFound.Text = "Store not found in database."
Panel_NotFound.Visible = True
Panel_NotFound.BringToFront()
GoTo Ender
Else
'Store found update UI
lblBranchInfo_StoreName.Text = args.Brief_StoreName
lblBranchInfo_POSNumber.Text = args.Brief_POSNumber
lblBranchInfo_CameraType.Text = args.Brief_STCamera
Panel_NotFound.Visible = False
Panel_NotFound.SendToBack()
End If
args = Nothing
End If
Ender:
btnStoreDetails.Enabled = True
End Sub
As you can see i've tried to make sure I'm not leaving anything behind, but the memory keeps jumping up and doesn't go down. Overall we're talking about 35MBs being used when this codes been ran only a few times and nothing else is happening with the program/form. Because this is on a remote virtual machine the program can be open for days without being closed, and with the memory usage increasing each time it will become a very big issue. Any help would be appreciated.