TextBox entry to filter datagridview bound to SQL database

  Private Sub JobHuntingForm_Load(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles MyBase.Load
        Me.PositionCompanyTableAdapter.Fill(Me.JobHuntingDataSet.PositionCompany)
        Me.CompanyTableAdapter.Fill(Me.JobHuntingDataSet.Company)
Me.PositionTableAdapter.Fill(Me.JobHuntingDataSet.Position)
Me.EmployeeTableAdapter.Fill(Me.JobHuntingDataSet.Employee)
Me.ContactTableAdapter.Fill(Me.JobHuntingDataSet.Contact)
End Sub

Private Sub titleComboBox_TextChanged(sender As Object, e As EventArgs) Handles titleTextBox.TextChanged
        If titleTextBox.Text <> "" Then
            PositionBindingSource.Filter = "Title Like '" & titleTextBox.Text.ToString & "%""'"
            PositionDataGridView.DataSource = PositionBindingSource.Filter
            allPositionButton.Visible = True
        End If
    End Sub

 Private Sub AllPositionsButton_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles allPositionButton.Click
        PositionBindingSource.RemoveFilter()
        allPositionButton.Visible = False
    End Sub