Help with creating a filter for a data grid!

I want to create a filter to filter text in a datagrid as i type in a text box. I have two text boxes, one to filter in text that i type and one to filter out text that i type. I want the data grid to update as i type into either one of the textboxes. Here is some of my code:

private void txtFilterIn_TextChanged(object sender, TextChangedEventArgs e)

        {

            DataView dv = dgPortStatus.DataContext as DataView;

            if (dv != null)

            {

                if (dv.Table.TableName.ToUpper() == "PORTSTATUS")

                {

                    FilterDataGrid(txtFilterIn.Text, txtFilterOut.Text, _dicPortStatus[cmbGroups.SelectedItem.ToString()]);

                }

            }

            List qvList = dgPortStatus.DataContext as List;

            if (qvList != null)

            {

                //Filter on quarantine manager

                FilterQuarantineViewList(qvList);

            }

        }

        private void btnFilterInClear_Click(object sender, RoutedEventArgs e)

        {

            txtFilterIn.Clear();

        }

        private void txtFilterOut_TextChanged(object sender, TextChangedEventArgs e)

        {

            DataView dv = dgPortStatus.DataContext as DataView;

            if (dv != null)

            {

                if (dv.Table.TableName.ToUpper() == "PORTSTATUS")

                {

                    FilterDataGrid(txtFilterIn.Text, txtFilterOut.Text, _dicPortStatus[cmbGroups.SelectedItem.ToString()]);

                }

            }

            List qvList = dgPortStatus.DataContext as List;

            if (qvList != null)

            {

                //Filter on Quarantine Manager

                FilterQuarantineViewList(qvList);

            }

        }

        private void btnFilterOutClear_Click(object sender, RoutedEventArgs e)

        {

            txtFilterOut.Clear();

        }

And this method is where my filter needs to go:

private void FilterQuarantineViewList(List qvList)

{

           

        

}