Novacode.Table.SetColumnWidth C# (CSharp) Method

        public void SetColumnWidth(Int32 index, Double width)
        {
            List<Double> widths = ColumnWidths;
            if (widths == null || index > widths.Count - 1)
            {
                if (Rows.Count == 0) throw new Exception("There is at least one row required to detect the existing columns.");
                // use width of last row cells
                // may not work for merged cell!
                widths = new List<Double>();
                foreach (Cell c in Rows[Rows.Count - 1].Cells)
                {
                    widths.Add(c.Width);
                }
            }

            // check if index is matching table columns
            if (index > widths.Count - 1) throw new Exception("The index is greather than the available table columns.");

            // get the table grid props
            XElement grid = Xml.Element(XName.Get("tblGrid", DocX.w.NamespaceName));
            // if null; append a new grid below tblPr
            if (grid == null)
            {
                XElement tblPr = GetOrCreate_tblPr();
                tblPr.AddAfterSelf(new XElement(XName.Get("tblGrid", DocX.w.NamespaceName)));
                grid = Xml.Element(XName.Get("tblGrid", DocX.w.NamespaceName));
            }

            // remove all existing values
            grid?.RemoveAll();

            // append new column widths
            Int32 i = 0;
            foreach (var w in widths)
            {
                double value = w;
                if (i == index) value = width;
                var gridCol = new XElement(XName.Get("gridCol", DocX.w.NamespaceName),
                    new XAttribute(XName.Get("w", DocX.w.NamespaceName), value));
                grid?.Add(gridCol);
                i += 1;
            }

            // remove cell widths
            foreach (Row r in Rows)
                foreach (Cell c in r.Cells)
                    c.Width = -1;

            // set fitting to fixed; this will add/set additional table properties
            this.AutoFit = AutoFit.Fixed;
        }