Hide Button in ASP.Net GridView if column value is null or empty

hello,

i would like hide the button if there is no file name/namefile in column.

<asp:Button ID="btnDelete" runat="server" Text="Delete" Visible='<%# Eval("Status").ToString() == "A" ? true : false %>' />

Status from database with users record?

i mean Status like my column Namefile and if no file will hide