c# - Exporting to Excel rich text box -

in c#, rich text content saved database in below format < b>hello< /b>.

i need export ms excel sheet hello (with bold letters)

when ever try export content in excel , not showing in rich text. kindly me . thanks,

           var workbook = new hssfworkbook();                            var sheet = workbook.createsheet("");                  int rownumber = 1;                            npoi.ss.usermodel.ifont font = workbook.createfont();             font.boldweight = (short)(npoi.ss.usermodel.fontboldweight.bold);             font.fontheight = 210;             font.fontname = "calibri";              npoi.ss.usermodel.icellstyle headercell = workbook.createcellstyle();             headercell.fillbackgroundcolor = npoi.ss.usermodel.indexedcolors.grey_25_percent.index;             headercell.fillforegroundcolor = npoi.ss.usermodel.indexedcolors.grey_25_percent.index;             headercell.fillpattern = npoi.ss.usermodel.fillpatterntype.solid_foreground;             headercell.verticalalignment = npoi.ss.usermodel.verticalalignment.center;             headercell.wraptext = true;             headercell.setfont(font);             headercell.borderbottom = npoi.ss.usermodel.borderstyle.thin;             headercell.borderleft = npoi.ss.usermodel.borderstyle.thin;             headercell.borderright = npoi.ss.usermodel.borderstyle.thin;             headercell.bordertop = npoi.ss.usermodel.borderstyle.thin;             npoi.ss.usermodel.ifont fontshort = workbook.createfont();             fontshort.boldweight = (short)(npoi.ss.usermodel.fontboldweight.normal);             fontshort.fontname = "calibri";              npoi.ss.usermodel.icellstyle normalcell = workbook.createcellstyle();             normalcell.fillbackgroundcolor = 50;             normalcell.verticalalignment = npoi.ss.usermodel.verticalalignment.center;             normalcell.wraptext = true;             normalcell.setfont(fontshort);             normalcell.borderbottom = npoi.ss.usermodel.borderstyle.thin;             normalcell.borderleft = npoi.ss.usermodel.borderstyle.thin;             normalcell.borderright = npoi.ss.usermodel.borderstyle.thin;             normalcell.bordertop = npoi.ss.usermodel.borderstyle.thin;              npoi.ss.usermodel.icellstyle emptycell = workbook.createcellstyle();             emptycell.setfont(font);             emptycell.borderbottom = npoi.ss.usermodel.borderstyle.none;             emptycell.borderleft = npoi.ss.usermodel.borderstyle.none;             emptycell.borderright = npoi.ss.usermodel.borderstyle.none;             emptycell.bordertop = npoi.ss.usermodel.borderstyle.none;     var headerrow = sheet.createrow(0);     var output ="<b>helloworld</b>"                                       var row = sheet.createrow(rownumber++);             row.createcell(0).setcellvalue(output);              row.cells[0].cellstyle = normalcell;