How to run a program using a bat file specifying the working directory?

Question

Command line

I create such batch file

File.WriteAllText("AVUC.bat", "@echo off\n" + 
                        "cd \"" + dirPath + "\"\n" +
                        "start AVUC.exe\n" +
                        "exit");

But the application (in C# if anything) cannot find the text file in its folder. I think the working directory is not correct. (The batch file is in autoload). How to write a command correctly so that the working directory is the folder in which the exe is located?