// Create a header for the table.
TableHeaderCell header = new TableHeaderCell();
header.RowSpan = 1;
header.ColumnSpan = 3;
header.Text = "Table of (x,y) Values";
header.Font.Bold = true;
header.BackColor = Color.Gray;
header.HorizontalAlign = HorizontalAlign.Center;
header.VerticalAlign = VerticalAlign.Middle;

// Add the header to a new row.
TableRow headerRow = new TableRow();
headerRow.Cells.Add(header);

// Add the header row to the table.
Table1.Rows.AddAt(0, headerRow);