Memory management question -> Form.Close()

[burak]

Hello,

 

In one of my winforms pages, I launch another form as follows

 

Private Sub btnExtract_Click(ByVal sender As Object, ByVal e As

System.EventArgs) Handles btnExtract.Click

 

Dim page As New ShowCourses

page.Show()

 

End Sub

 

When this form comes up, I fill a datagrid and then set the dataset

and datadapter to nothing.

 

After the user looks at the datagrid, they can close this page as

follows:

 

Private Sub btnBack_Click(ByVal sender As System.Object, ByVal e As

System.EventArgs) Handles btnBack.Click

Me.Close()

End Sub

 

I observed the Memory Usage for this app from the Processes tab in

the Windows Task Manager and it looked lke the memory usage stayed the

same even though this form was closed.

 

How do we close a form and release the memory it uses back to the

system?

 

Thank you,

 

Burak

[PlausiblyDamp]

You could call the Dispose method of the form to free up memory quicker. However memory management under .Net uses garbage collection - this means memory isn't freed up immediately, but rather when the system deems it necessary. Search these forums for 'Garbage Collection' and you will find several threads that discuss this issue.

[burak]

Thank you,

 

Would you also happen to know the answer to this problem???

 

 

Cannot access disposed object named 'DataGridTextBox'

 

 

Hello,

 

I am working on a windows forms app with a datagrid. In my mouse down

event, I am calling Me.Close() and am running into the following error

 

Cannot access disposed object named "DataGridTextBox"

Object name: "DataGridTextBox"

 

Private Sub dtgResults_MouseDown(ByVal sender As Object, ByVal e As

System.Windows.Forms.MouseEventArgs) Handles dtgResults.MouseDown

Dim str As String = ""

 

Dim hti As DataGrid.HitTestInfo

 

hti = dtgResults.HitTest(e.X, e.Y)

 

Try

 

If hti.Type = DataGrid.HitTestType.Cell Or hti.Type =

DataGrid.HitTestType.RowHeader Then

 

str += dtgResults(hti.Row, 0).ToString()

 

global_vars.PROVIDS = str

 

End If

 

Catch ex As Exception

 

MsgBox(ex.Message)

 

End Try

 

If str <> "" Then

 

Me.Close()

 

End If

 

End Sub

 

 

What am I doing wrong?

 

Burak