Hi Rahul,
Please use following code:
.CSS
.cssUnderline {
text-decoration:underline;
}
.cssNoUnderline {
text-decoration:none;
}
.ASPX
<asp:templatecolumn headertext="CHF FileName" xmlns:asp="#unknown">
<headerstyle width="30%"></headerstyle>
<itemtemplate>
<asp:linkbutton cssclass="<%# DataBinder.Eval(Container, "DataItem.CHFFILENAME") == "A") ? "cssUnderline": "cssNoUnderline " %>" commandname="CHFFileName" runat="server" enabled="<%# (Eval("CHFFILENAME").ToString() == "DIRECT UPLOAD") ? false:true%>" text="<%# DataBinder.Eval(Container, "DataItem.CHFFILENAME")%>" id="lnkchffilename"></asp:linkbutton>
</itemtemplate>
</asp:templatecolumn>