How can I get application root folder location in C# Console application?

You cannot directly get URL for root folder of your project in Console Application, like Web-application, as console application run from "\bin\debug", so you will have to use this code

// to get the location the assembly is executing from
string path = System.Reflection.Assembly.GetExecutingAssembly().Location;

//once you have the path you get the directory with:
var directory = System.IO.Path.GetDirectoryName(path);

to get the location where "Program.cs" file resides or you can say exact root of console project, try this workaround

     //returns url of main directory which contains "/bin/Debug"
            var url=System.IO.Path.GetDirectoryName(
    System.Reflection.Assembly.GetExecutingAssembly().GetName().CodeBase);
 
            
            //correction in path to point it in Root directory
            var mainpath = url.Replace("\\bin\\Debug", "");

mainpath = "C:\YourProjectName".

OR

  var url = System.AppContext.BaseDirectory; //returns path "C:\..\bin\debug"

You can use 'System.AppContext.BaseDirectory' in .NET Core Console application or .NET 4.6 to get application path.

OR

System.Reflection.Assembly.GetExecutingAssembly().CodeBase

I will say it is better to use first method 'System.AppContext.BaseDirectory'. Since 'Assembly.Codebase' is obsolete.