DataGridView column footer c#.net winforms

Question

Is there a way to add a column footer in a datagridview which is not databound? I am using it to take user input for adding inventory. Currently I am using a la

Answer 1

In one of my applications I solved it by taking advantage of NewRow of DataGridView like this.

using System;
using System.Drawing;
using System.Windows.Forms;

namespace WindowsFormsApplication2
{
    public partial class Form1 : Form
    {
        public Form1()
        {
            InitializeComponent();

            this.dataGridView1.CellFormatting += dataGridView1_CellFormatting;
            this.dataGridView1.CellValueChanged += dataGridView1_CellValueChanged;
        }

        void dataGridView1_CellValueChanged(object sender, DataGridViewCellEventArgs e)
        {
            if (e.RowIndex != this.dataGridView1.NewRowIndex && e.ColumnIndex == 2)
            {
                this.dataGridView1.InvalidateRow(this.dataGridView1.NewRowIndex);
            }
        }

        void dataGridView1_CellFormatting(object sender, DataGridViewCellFormattingEventArgs e)
        {
            if (e.RowIndex == this.dataGridView1.NewRowIndex)
            {
                e.CellStyle.Font = new Font(e.CellStyle.Font, FontStyle.Bold);
                e.CellStyle.ForeColor = Color.Red;
                switch (e.ColumnIndex)
                {
                    case 0:
                        e.Value = "Total";
                        break;

                    case 2:
                        var sum = 0.0d;
                        for (int i = 0; i < this.dataGridView1.NewRowIndex; i++)
                        {
                            var value = this.dataGridView1[2, i].Value;
                            if (value is double)
                            {
                                sum += ((double)value);
                            }
                        }
                        e.Value = Math.Round(sum, 2);
                        break;
                    // Single line version of case 2 would be
                    // e.Value = this.dataGridView1.Rows.Cast().Where(a => a.Index != a.DataGridView.NewRowIndex).Select(a => (double)a.Cells[2].Value).Sum().ToString("N2");
                }
            }
        }

    }
}

Here is live screenshot of how it works.