Update Cell Value in Excel using ClosedXML

Hi Guys,

I am generating Excel file by putting some data's from XML files. In that excel, I want to make a Partial text in Cell into or (not full text).

I used the below code when i used Microsoft.Interop.Excel. it works fine for me. But now i need to do this using CloedXML. I really don't know how to do this. i searched many pages but i didn't get what i required. Can any one tell me the anwser...

Label:
Excel.Range rn7 = osheet.Cells[i, 6] as Excel.Range;
string text = rn7.Text;
rn7.Select();
if(rn7.Characters.Count <= 256)
{
if (text.Contains(""))
{
int startindex = rn7.Text.IndexOf("");
int endindex = rn7.Text.IndexOf("");
rn7.Characters[startindex+1, 3].Delete();
rn7.Characters[endindex-2, 4].Delete();
rn7.Characters[startindex, (endindex - startindex)-2].Font.Italic = 2;
}
if (text.Contains(""))
{
int startindex = rn7.Text.IndexOf("");
int endindex = rn7.Text.IndexOf("");
rn7.Characters[startindex + 1, 3].Delete();
rn7.Characters[endindex - 2, 4].Delete();
rn7.Characters[startindex, (endindex - startindex)-2].Font.Bold = 2;
}
if (text.Contains(""))
{
int startindex = rn7.Text.IndexOf("");
int endindex = rn7.Text.IndexOf("");
rn7.Characters[startindex + 1, 4].Delete();
rn7.Characters[endindex - 3, 5].Delete();
rn7.Characters[startindex, (endindex - startindex) - 3].Font.Italic = 2;
}
if (text.Contains(""))
{
int startindex = rn7.Text.IndexOf("");
int endindex = rn7.Text.IndexOf("");
rn7.Characters[startindex + 1, 4].Delete();
rn7.Characters[endindex - 3, 5].Delete();
rn7.Characters[startindex, (endindex - startindex) - 2].Font.Name = "Times New Roman";
}
rn7.VerticalAlignment = Excel.XlVAlign.xlVAlignTop;
rn7.HorizontalAlignment = Excel.XlHAlign.xlHAlignLeft;
text = rn7.Text;
if (Regex.IsMatch(text,@"\<(b|i|fi|fr)\>"))
{
goto Label;
}
}
else
{
text = Regex.Replace(text,@"(<(\/)?(fr|fi|b|i)>)","");
rn7.Value = text;
}