How to add child application using Microsoft.Web.Administration?

Question

I am using .NET Core Console application to create web site and its child application like below

        ServerManager serverManager = new ServerManager();
        Site webSite = serverManager.Sites.Add("MywebSite", @"C:\MywebSite", 80);            
        webSite.Applications.Add("Child1","C:\MyChildApplication");
        webSite.ServerAutoStart = true;
        serverManager.CommitChanges();

However i am getting error

System.Exception: Invalid application path

at Microsoft.Web.Administration.Interop.IAppHostProperty.set_Value(Object value) at
Microsoft.Web.Administration.ConfigurationElement.SetAttributeValue(String attributeName, Object value) at
Microsoft.Web.Administration.ApplicationCollection.Add(String path, String physicalPath) at
IISHelper.CreateWebSites(Settings settings) in XXXXXXXXX\IISHelper.cs:line 14 at
XXXX.Program.Main(String[] args) in XXXXXXXXX\Program.cs:line 15

Answer 1

All applications need to have their paths starting with / (a convention with little explanation, so simply follow it).

Thus, in your case, you should use /Child1.