Hi AnikSol,

To add an extra row, which doesn't belong to the underlying data source,
into a data grid view, I think you could paint the cells of that row by
yourself. To do this, you may handle the CellPainting event of the data
grid view.

The following is a sample. In the sample, I draw the extra row in the new
row within the data grid view.

public partial class Form1 : Form
   {
       public Form1()
       {
           InitializeComponent();
           this.dataGridView1.CellPainting += new
DataGridViewCellPaintingEventHandler(dataGridView1_CellPainting);          
       }
       void dataGridView1_CellPainting(object sender,
DataGridViewCellPaintingEventArgs e)
       {
           int sum = 0;
           // only draw the cells of the extra row by ourselves, leaving
the rest cells to the system
           if (e.RowIndex == this.dataGridView1.NewRowIndex &&
e.ColumnIndex > -1)
           {          
               for (int i = 0; i < this.dataGridView1.NewRowIndex; i++)
               {
                    if
(this.dataGridView1.Rows[i].Cells[e.ColumnIndex].Value.ToString().Trim() !=
"")
                   {
                       sum +=
(int)this.dataGridView1.Rows[i].Cells[e.ColumnIndex].Value;
                    }
               }
               e.PaintBackground(e.CellBounds, false);
               e.Graphics.DrawString(sum.ToString(),
this.dataGridView1.Font, Brushes.Black, e.CellBounds.Left +
2,e.CellBounds.Top + 2);
               
               e.Handled = true;
           }
       }
    }

Hope this helps.
If you have anything unclear, please feel free to let me know.

Sincerely,
Linda Liu
Microsoft Online Community Support

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Thanks so much for posting this.  The code works great and saved me alot of headache. So thanks again

From http://www.developmentnow.com/g/31_2006_10_0_0_831733/DataGridView-Summary-Row.ht