Hi FengLange,

here is some reference from class library which defined Table method, just for your Ref.

public Table(int columns, int rows) : base(0, 0, 0, 0) {
            Border = BOX;
            BorderWidth = 1;
            defaultLayout.Border = BOX;

            // a table should have at least 1 column
            if (columns <= 0) {
                throw new BadElementException("A table should have at least 1 column.");
            }
            this.columns = columns;

            // a certain number of rows are created
            for (int i = 0; i < rows; i++) {
                this.rows.Add(new Row(columns));
            }
            curPosition = new System.Drawing.Point(0, 0);

            // the DEFAULT widths are calculated
            widths = new float[columns];
            float width = 100f / columns;
            for (int i = 0; i < columns; i++) {
                widths[i] = width;
            }

Regards,

Robin