Hi akhter,

Apply proper permissions to the folders it does not have access.

You need to provide Read/Write permissions to

IIS_USR

NETWORK SERVICE

IIS_USRS

Access to the path denied error also came if file doesn't exist.

Before Response.WriteFile you should perform a check to see if the file exists first.

This will also give you the opportunity of making sure that the path it's attempting to get will work.

if(File.Exist(fileName))
{ 
    Response.AppendHeader("content-disposition", "attachment; filename=" + fileName);
    Response.ContentType = "application/sql";
    Response.WriteFile(fileName);
    Response.End();
}