Could not find path in the web application

Question

I am trying to write to a text file usingASP.NET 4.5 with c# using the following code:

using (System.IO.StreamWriter file = new System.IO.StreamWriter(@"./Experiment/main.txt", true))
{
file.WriteLine(DateTime.UtcNow.ToString() + " test");
}

And I am getting this exception:

"Could not find a part of the path 'C:\Windows\SysWOW64\inetsrv\Experiment\main.txt'."

The folder Experiment is the folder of my web application.

Answer 1

You need to give physical path instead of relative path, use Server.MapPath("~") to get the root path of your site and then append the path of file to it. You can learn more about Server.MapPath in this post.

using (System.IO.StreamWriter file = new System.IO.StreamWriter(Server.MapPath(@"~/Experiment/main.txt"), true))
{
     file.WriteLine(DateTime.UtcNow.ToString() + " test");
}