VSTO word error

Question

I am getting issue like this "Item with specified name does not exist."

my code

 

Selection wordsec = Globals.ThisAddIn.Application.Selection;

 

if (sTextSz == "10")

{

object Text10 = "TableText10";

wordsec.set_Style(ref Text10);

}

else if (sTextSz == "9")

{

wordsec.set_Style("TableText9");

}

else

{

wordsec.set_Style("TableText8");

}

 

Please anyone send me the code in VSTO word