Compare old and new value in DataGridView cell

Question

How to change DataGridView cell ForeColor based on whether new cell value is > or < than current/old cell value? Is there an event which passes the new value before the

Answer 1

If the inner source of DataGridView control is a DataTable then you can utilize the older version of DataRow using DataRowVersion enum. Note that I have utilized CellFormatting Event.

Example:

private void DataGridView1_CellFormatting(object sender, DataGridViewCellFormattingEventArgs e)
{
    // if NOT the DataGridView's new row
    if (!this.dataGridView1.Rows[e.RowIndex].IsNewRow)
    {
        // if my desired column
        if (e.ColumnIndex == 0)
        {
            TestDataSet.TestRow row;

            row = (TestDataSet.TestRow)((DataRowView)this.dataGridView1.Rows[e.RowIndex].DataBoundItem).Row;

            if (row.Column1, (int)row["Column1", DataRowVersion.Original]) > 0)
                    e.CellStyle.ForeColor = Color.Red;
        }
    }
}