C# 2015 - datagridviewcellformatting event ok on form load, but not working properly on textchange event

Hello guys,

Greetings from Brazil!  I'm a beginner programmer developing a Visual Studio 2015 C# WinForms database application with MySQL.

I have a DataGridViewCellFormatting event on the form and it works perfectly when the form loads, but when the DataGridView is updated triggered by a TextChanged event to search for records, the cell formatting event doesn't work properly anymore.

If the value of column 4 is negative, than the row forecolor should be red and if the value is positive the row forecolor should be blue, as it happens when the form loads

I've tried Update, Refresh, Invalidate and everything else on the book, but it doesn't work.  Thank you.  I really appreciate your time and help!

Best regards,

JC.

Here's my code:

        private void caixaDataGridView_CellFormatting(object sender, DataGridViewCellFormattingEventArgs e)
        {
            caixaDataGridView.RowsDefaultCellStyle.BackColor = Color.White;
            caixaDataGridView.AlternatingRowsDefaultCellStyle.BackColor = Color.LightGray;

            try
            {
                decimal valor = Convert.ToDecimal(bremi691_appDataSet.caixa.Rows[e.RowIndex]["valor"]);

                if (valor < 0)
                {
                    e.CellStyle.ForeColor = Color.Red;
                }
                else
                {
                    e.CellStyle.ForeColor = Color.Blue;
                }
            }
            catch (Exception)
            {
            }
        }


And for the TextChanged event:

        private void txtSearch_TextChanged(System.Object sender, System.EventArgs e)
        {
            try
            {
                if (cboColumn.Text == "Nome")
                {
                    caixaBindingSource.Filter = string.Format("nome LIKE '{0}%'", txtSearch.Text);
                }

                if (cboColumn.Text == "Tipo")
                {
                    caixaBindingSource.Filter = string.Format("tipo LIKE '{0}%'", txtSearch.Text);
                }

                if (cboColumn.Text == "Referência")
                {
                    caixaBindingSource.Filter = string.Format("referencia LIKE '{0}%'", txtSearch.Text);
                }
            }
            catch (Exception)
            {
            }
        }