Access to the path is denied

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C#

when i have developed exe format and install, the error comes like Access to the path is denied.I want to save the file in local.So i gave the like
Code sample

var path = Environment.CurrentDirectory;
string filename=path+"Xyz"+Datetime.now+".pdf";
string pdffile="Xyz"+Datetime.Now+".pdf";
pdf.save(pdffile);


The error show Access to the path is denied.Here i'm developing pdf file.when i click it saves in local file..