Using Background Worker VB.NET - vb.net

Question

I have to show many transaction on any table. It takes so much long time to process.
I want to use a background process in visual basic 2010, but it always give an error message like this "Cross thread operation detected". I have try so many ways that i found in the internet, but still can't find what the problem is.
Please help me about how to fix this problem.
This is my code :
Private Sub CHK_A_CheckedChanged(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles CHK_A.CheckedChanged
Disabled()
P_Panel.Visible = True
B_Worker.RunWorkerAsync()
End Sub
Private Sub BTN_Search_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles BTN_Search.Click
USP_Select_Registration()
End Sub
Private Sub B_Worker_DoWork(ByVal sender As System.Object, ByVal e As System.ComponentModel.DoWorkEventArgs) Handles B_Worker.DoWork
Threading.Thread.Sleep(25)
USP_Select_Registration()
End Sub
Private Sub B_Worker_RunWorkerCompleted(ByVal sender As Object, ByVal e As System.ComponentModel.RunWorkerCompletedEventArgs) Handles B_Worker.RunWorkerCompleted
P_Panel.Visible = False
End Sub
This one is my store procedure
Public Sub USP_Select_Registration()
Dim Con As New SqlConnection(SQLCon)
Try
Con.Open()
Dim Cmd As New SqlCommand("USP_Select_Registration", Con)
Cmd.CommandType = CommandType.StoredProcedure
Cmd.Parameters.Add("#Check", SqlDbType.Bit).Value = CHK_A.EditValue
Cmd.Parameters.Add("#Month", SqlDbType.Int).Value = CBO_Month.SelectedIndex + 1
Cmd.Parameters.Add("#Year", SqlDbType.Int).Value = SPE_Year.EditValue
Cmd.Parameters.Add("#Search", SqlDbType.VarChar, 150).Value = TXT_Search.Text
DS_Registration.Tables("MST_Registration").Clear()
Dim Adt As New SqlDataAdapter(Cmd)
Adt.Fill(DS_Registration.Tables("MST_Registration"))
Catch ex As Exception
MsgBox(ex.Message, MsgBoxStyle.Critical, "Error")
Finally
Con.Close()
End Try
End Sub

Answer 1

I think you get error because inside of USP_Select_Registration you trying to read values from form control's. Which was created by another thread.
RunWorkComleted executes in the same thread where Backgroundworker was created, thats why code P_Panel.Visible = False will executes normally.
But DoWork executes on the another thread.
And when you tried to access some forms controls to read values
TXT_Search.Text - it raise error
You can pass you searching parameters to BackgroundWorker, but you need to add parameters to USP_Select_Registration function.
For example:
Private Sub USP_Select_Registration(searchText as String)
'Your code here
End Sub
Then where you start BackgroundWorker:
B_Worker.RunWorkerAsync(TXT_Search.Text)
And
Private Sub B_Worker_DoWork(ByVal sender As Object,
ByVal e As DoWorkEventArgs) Handles B_Worker.DoWork
Threading.Thread.Sleep(25)
USP_Select_Registration(e.Argument)
End Sub
In your case you need to pass more then one parameter.
So you can create some structure/class or whatever object where you can keep all needed values. And pass that object to RunWorkerAsync