Hi Sathish,
This issues are common, you need to decode the value using HttpUtility like this
string outputstr = HttpUtility.HtmlDecode(row.Cells[4].Text);
txt_name.Text = outputstr;
or
txt_name.Text = HttpUtility.HtmlDecode(row.Cells[4].Text);
Hope this helps you a bit.
Regards,
RK