Get the next file name to upload - asp.net

Question

I have the following C# code (which is about uploading files to the server)
for (int i = 0; i < Request.Files.Count-1; i++)
{
if (Request.ContentLength != 0)
{
int Size = Request.Files[i].ContentLength / 1024;
if (Size <= 512)
{
string LocalFile = Request.Files[i].FileName;
int dot = LocalFile.LastIndexOf('.');
string FileType = LocalFile.Substring(dot + 1);
if (FileType == "gif" || FileType == "jpg" || FileType == "png" || FileType == "GIF" || FileType == "JPG" || FileType == "PNG")
{
int LastIndex = LocalFile.LastIndexOf(#"\") + 1;
string File = LocalFile.Substring(LastIndex, LocalFile.Length - LastIndex);
string Path = Server.MapPath(" ../images/tracks") + "..\\" + File;
Request.Files[i].SaveAs(Path);
if (i != Request.Files.Count - 1)
ImageList += string.Format("images/tracks/{0}|", File);
else { ImageList += string.Format("images/tracks/{0}", File); }
}
}
else
{
Response.Write("The file is too big !");
}
}
else
{
Response.Write("Unknown Error !");
}
}
The problem is that there is more than one file upload field.
I want to creat condition, that will check if there is file after file[i] (chack if file[i+1] empty)
if yes the program will do this code: ImageList += string.Format("images/tracks/{0}", File);
else: ImageList += string.Format("images/tracks/{0}|", File);
My question is how the condition should be look like?
Whish for help, thanks!

Answer 1

Just remove your condition(If) and add all strings with Ending character. at the end of loop, you can remove the last character, if it is "|".
On your code:
for (int i = 0; i < Request.Files.Count-1; i++)
{
if (Request.ContentLength != 0)
{
int Size = Request.Files[i].ContentLength / 1024;
if (Size <= 512)
{
string LocalFile = Request.Files[i].FileName;
int dot = LocalFile.LastIndexOf('.');
string FileType = LocalFile.Substring(dot + 1);
if (FileType == "gif" || FileType == "jpg" || FileType == "png" || FileType == "GIF" || FileType == "JPG" || FileType == "PNG")
{
int LastIndex = LocalFile.LastIndexOf(#"\") + 1;
string File = LocalFile.Substring(LastIndex, LocalFile.Length - LastIndex);
string Path = Server.MapPath(" ../images/tracks") + "..\\" + File;
Request.Files[i].SaveAs(Path);
//if (i != Request.Files.Count - 1)
ImageList += string.Format("images/tracks/{0}|", File);
//else { ImageList += string.Format("images/tracks/{0}", File); }
}
}
else
{
Response.Write("The file is too big !");
}
}
else
{
Response.Write("Unknown Error !");
}
}
//Remove the last character
if (ImageList.EndsWith("|")) ImageList = ImageList.Remove(ImageList.Length - 1, 1);
}