Thank you for the reply.
I did try to use ApplyStyle(). Unfortunately, this Method does not accept a string (only builtinStyles)
Here is my code:
IWTable table = section.AddTable();
table.ResetCells(11,2);
table.TableFormat.Borders.BorderType = BorderStyle.None;
cellWidths = new float[] { 250f, 200f };
SetCellWidth(table, cellWidths);
table.ApplyStyle("CustomStyle"); (ErrorMessage: conversion from string to builtinTableStyle not possible)
Regards
Franz