ASP.NET

protected void GridView1_RowDataBound(object sender, GridViewRowEventArgs e)
    {
        if(e.Row.RowType == DataControlRowType.Header)
        {
            TableHeaderCell cell = new TableHeaderCell();
            cell.Text = "Column 6 Name";
            e.Row.Cells.Add(cell);
        }
        else if (e.Row.RowType == DataControlRowType.DataRow)
        {
            TableCell cell = new TableCell();
            decimal result = Convert.ToDecimal(e.Row.Cells[2].Text) - Convert.ToDecimal(e.Row.Cells[3].Text);
            cell.Text = result.ToString();
            e.Row.Cells.Add(cell);
        }
        else
        {
            TableCell cell = new TableCell();
            e.Row.Cells.Add(cell);  //Empty Cell.//
        }
    }

Subin Mavunkal wrote:

Details: To enable the details of this specific error message to be viewable on remote machines, please create a <customerrors> tag within a "web.config" configuration file located in the root directory of the current web application. This <customerrors> tag should then have its "mode" attribute set to "Off".