File.Delete('imagepath'); works fine on local server but not on live server

HI All,

 I have ollowing code to delete the image by using  File.Delete(fileNamefordel + ".jpg");  function. It works fine on local server but not on uploaded server. 
string fileNamefordel = Server.MapPath("StdImage") + "\\" + (Session["lCandidateID"]).ToString();
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