Write folder file in c#

string[] filePaths = Directory.GetFiles(@"d:\test\");
        foreach ( var kk in filePaths)
        {
           
            Response.Write(Path.GetFileName(kk)+"<br>");
        }

Gridview url concatenate

NavigateUrl='<%# Eval("Id", "~/Details.aspx?Id={0}") %>'
PostBackUrl=' <%# FundName_url(Eval("DisplayName", "https://abc.com?schemeName={0}")) %>'
Multi parameter:-

NavigateUrl='<%# string.Format("~/Details.aspx?Id={0}&Name={1}&Country={2}",

HttpUtility.UrlEncode(Eval("Id").ToString()), HttpUtility.UrlEncode(Eval("Name").ToString()), HttpUtility.UrlEncode(Eval("Country").ToString())) %>'