table.cs

public static class TableExtender {
		
	public static void AdaptSize(this Table table, TextControl TextControl) {

	  if (table == null)
	    return;

	  TextControl.PageUnit = MeasuringUnit.Twips;

	  // calculate the max available width
	  var maxWidth = TextControl.Sections.GetItem().Format.PageSize.Width -
		    TextControl.Sections.GetItem().Format.PageMargins.Left -
		    TextControl.Sections.GetItem().Format.PageMargins.Right;

	  // loop through all cells
	  for (int row = 1; row <= table.Rows.Count; row++) {

	    // reset the calculated width
	    var currentWidth = 0;

	    // row by row
	    for (int col = 1; col <= table.Columns.Count; col++) {
	      // calculate the complete width of the row
	      currentWidth += table.Cells[row, col].Width;
	    }

	    // calculate the missing gap
	    var destinationWidth = currentWidth - maxWidth;

	    // loop through all columns in current row
	    for (int col = 1; col <= table.Columns.Count; col++) {

	      // calculate the ratio percentage for each cell
	      float percentage = (float)table.Cells[row, col].Width /
				 (float)currentWidth;

	      // resize the actual cell by it's calculated ratio
	      table.Cells[row, col].Width = (int)(table.Cells[row, col].Width -
					    (destinationWidth * percentage));
	    }

	  }
	}
}