Question

I need to change the colour of gridview cells based on the data value. I can quite easily do this using a datarow view in the Gridviews RowDataBound Event and an if statement (see below), however I need to do this on 30 columns which will be rather long winded and a pain to change if the business rules change. How can I encapsulate the following into a reusable method that I can call and just pass in the data column and the cell index ?

    protected void gv1_RowDataBound(object sender, GridViewRowEventArgs e)
    {
        if (e.Row.DataItem != null)
        {
            DataRowView drv = (DataRowView)e.Row.DataItem;

            int A = Int32.Parse(drv["A"].ToString());
            if (A <= 74)
            {
                e.Row.Cells[2].BackColor = System.Drawing.Color.Red;
            } 
        }
    }

Answer 1

public void SetColor(DataGridViewRow row, string columnName, int cellIndex)
{
    var data = (GridViewRow)row.DataItem;
    int number = Convert.ToInt32(data[columnName]);
    if (number > 74) return;

    row.Cells[cellIndex].BackColor = Color.Red;
}

protected void gv1_RowDataBound(object sender, GridViewRowEventArgs e)
{
    if (e.Row.RowType != DataRowType.DataRow) return;
    SetColor(e, "A", 2);
}