asp.net - Get the next file name to upload -

i have following c# code (which uploading files server)

for (int = 0; < 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 big !");                         }                     }                     else                     {                         response.write("unknown error !");                     }                 } 

the problem there more 1 file upload field.

i want creat condition, check if there file after file[i] (chack if file[i+1] empty) if yes program code: imagelist += string.format("images/tracks/{0}", file);

else: imagelist += string.format("images/tracks/{0}|", file);

my question how condition should like?

whish help, thanks!

just remove condition(if) , add strings ending character. @ end of loop, can remove last character, if "|".

on code:

for (int = 0; < 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 big !");                     }                 }                 else                 {                     response.write("unknown error !");                 }             }            //remove last character            if (imagelist.endswith("|")) imagelist = imagelist.remove(imagelist.length - 1, 1); }