c# - Start index cannot be larger than the length of the string -


i'm trying check if foldername doesn't have extension.
because want change name of folder.
can change name of file.

and error:

"startindex cannot larger length of string.\r\nparameter name: startindex"}

by line:

 string newfilenameextension = path.getextension(model.filename.trim()).substring(1);

how check if foldername has no extension?

you should have code in following way - 

string newfilenameextension = path.getextension("sample".trim()); string extn = string.empty;  if (!string.isnullorwhitespace(newfilenameextension)) {       extn = newfilenameextension.substring(1); }  if(!string.isnullorwhitespace(extn)) {       // use extn here }

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