test.cs

using TXTextControl;

public static class TableExtender
{

    public static void AdaptSize(this Table table, ServerTextControl 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));
            }

        }
    }
}