Download file in Zip - asp.net-mvc-4

Question

i want to download file in zip,but i got error my code and regarding error are bellow
My code:
using (ZipFile zip = new ZipFile())
{
zip.AlternateEncodingUsage = ZipOption.AsNecessary;
zip.AddDirectoryByName("Files");
//foreach (GridViewRow row in GridView1.Rows)
//{
// if ((row.FindControl("chkSelect") as CheckBox).Checked)
// {
// string filePath = (row.FindControl("lblFilePath") as Label).Text;
// zip.AddFile(filePath, "Files");
// }
//}
DirectoryInfo directory = new DirectoryInfo(Server.MapPath(#"~\Election\Latur"));
var files = directory.GetFiles().ToList();
foreach (var file in files)
{
zip.AddFile(file.ToString(),"Files");
}
Response.Clear();
Response.BufferOutput = false;
string zipName = String.Format("Zip_{0}.zip", DateTime.Now.ToString("yyyy-MMM-dd-HHmmss"));
Response.ContentType = "application/zip";
Response.AddHeader("content-disposition", "attachment; filename=" + zipName);
zip.Save(Response.OutputStream);
Response.End();
}
when am using above code for download file in zip then follwing error occure
error

Answer 1

There are two possible cause of this error:
1- The directory "Files" not possible create(denied permission)
2- Not possible obtain files into "~\Election\Latur"
Anyway the lines:
var files = directory.GetFiles().ToList();
foreach (var file in files)
The type var i think is not correct for this. String with base64 coder is more correct.

Answer 2

using (ZipFile zip = new ZipFile())
{
string folderpath = Server.MapPath(#"~\Election\Latur\");
zip.AlternateEncodingUsage = ZipOption.AsNecessary;
zip.AddDirectoryByName("Files");
DirectoryInfo directory = new DirectoryInfo(Server.MapPath(#"~\Election\Latur"));
var files = directory.GetFiles().ToList();
foreach (var file in files)
{
var filepath = folderpath + file.ToString();
zip.AddFile(filepath,"Files");
}
Response.Clear();
Response.BufferOutput = false;
string zipName = String.Format("Zip_{0}.zip", DateTime.Now.ToString("yyyy-MMM-dd-HHmmss"));
Response.ContentType = "application/zip";
Response.AddHeader("content-disposition", "attachment; filename=" + zipName);
zip.Save(Response.OutputStream);
Response.End();
}