DataGridView and BindingSource timer issue - sql

Question

I have a DataGridview that displays the data and a TextBox that allows me to filter the BindingSource with an SQL query to display the data based on the input string. This is all working fine apart from once I have filtered the DataGridView the timer function I have is resetting it back so all the data is being displayed again. The timer is set on a 1000ms basis, so it will show the filtered result for a second, then revert back.
Heres my code:
Imports System.Data.OleDb
Public Class Form1
Dim duraGadgetDB As String = "Provider=Microsoft.Jet.OLEDB.4.0; Data Source = C:\Users\Dave\Documents\duraGadget.mdb;"
Private Sub Form1_Load(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles MyBase.Load
Dim sql As String = "SELECT * FROM duragadget"
Dim connection As New OleDbConnection(duraGadgetDB)
Dim dataadapter As New OleDbDataAdapter(sql, connection)
Dim ds As New DataSet()
connection.Open()
dataadapter.Fill(ds, "dura")
connection.Close()
DataGridView1.DataSource = ds
DataGridView1.DataMember = "dura"
DataGridView1.Columns(5).Width = 300
End Sub
Private Sub Button2_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles Button2.Click
insert.Show()
End Sub
Private Sub Timer1_Tick(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles Timer1.Tick
Dim currentRowID As Integer
Dim scrollPosition As Integer = DataGridView1.FirstDisplayedScrollingRowIndex
Try
If DataGridView1.CurrentRow IsNot Nothing Then
currentRowID = DataGridView1.CurrentRow.Index
Dim sql As String = "SELECT * FROM duragadget"
Dim connection As New OleDbConnection(duraGadgetDB)
Dim dataadapter As New OleDbDataAdapter(sql, connection)
Dim ds As New DataSet()
connection.Open()
dataadapter.Fill(ds, "dura")
connection.Close()
DataGridView1.DataSource = ds
DataGridView1.DataMember = "dura"
DataGridView1.CurrentCell = DataGridView1.Item(1, currentRowID)
End If
Catch ex As Exception
End Try
DataGridView1.FirstDisplayedScrollingRowIndex = scrollPosition
End Sub
Private Sub txtSearchOnSku_TextChanged(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles txtSearchOnSku.TextChanged
Dim currentRowID As Integer
Dim scrollPosition As Integer = DataGridView1.FirstDisplayedScrollingRowIndex
Try
If DataGridView1.CurrentRow IsNot Nothing Then
currentRowID = DataGridView1.CurrentRow.Index
Dim sql As String = "SELECT * FROM duragadget"
Dim connection As New OleDbConnection(duraGadgetDB)
Dim dataadapter As New OleDbDataAdapter(sql, connection)
Dim ds As New DataSet()
Dim dsView As New DataView
Dim bs As New BindingSource()
connection.Open()
dataadapter.Fill(ds, "dura")
connection.Close()
dsView = ds.Tables(0).DefaultView
bs.DataSource = dsView
bs.Filter = "skuNo LIKE'" & txtSearchOnSku.Text & "*'"
DataGridView1.DataSource = bs
DataGridView1.CurrentCell = DataGridView1.Item(1, currentRowID)
End If
Catch ex As Exception
End Try
DataGridView1.FirstDisplayedScrollingRowIndex = scrollPosition
End Sub
End Class
Can anyone tell me how to stop this happening?

Answer 1

Assuming you mean that, if you have entered a value in your text box to filter your results, that you then don't want you timer to fire and unfilter them...
You can either, check the contents of the TextBox in the Timer1_Tick routine;
If txtSearchOnSku.Text <> "" Then Exit Sub
Or you can disable your timer in the txtSearchOnSku_TextChanged routine;
If txtSearchOnSku.Text <> "" Then
Timer1.Stop
Else
Timer1.Start
End If
Or, if you want to update your results once a second, based on you search, you can include the Filtering code in your Timer1_Tick routine.
As a quick point, you have alot of repeated code there. It may be worthwhile refactoring the repeated code out into another sub.