Cannot write text as bold

[makin4990]

Hi,
i am trying to write text as bold but no matter what i do, i cant see result bold.

bool bld = true; //same result for false
var cellProperties1 = new docx.TableCellProperties(new NoWrap { Val = OnOffOnlyValues.On });
var tableCell1Width = new docx.TableCellWidth { Type = docx.TableWidthUnitValues.Dxa, Width = "4000" };
cellProperties1.Append(new Bold() { Val = bld ? new OnOffValue { Value = true } : new OnOffValue { Value = false } });
cellProperties1.Append(tableCell1Width);
cellProperties1.Append(verticalMerge1);