How to avoid the exception of access denied on trying to create virtual directory in IIS using C#?

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C#

IIS

I am trying to connect and create virtual directory in c#. While trying to create virtual directory i am getting access denied issue.

I have given permission to IIS USERS . Added

computername\IIS_IUSRS

& everyone too.

Exception occuring at

DirectoryEntry folderRoot = _iisServer.Children.Find("Root",VirDirSchemaName);

What I have tried:

/// <summary>
///     Create a virtual directory
/// </summary>
/// <param name="nameDirectory">Name of the new virtual directory</param>
/// <param name="realPath">Path of the directory</param>
public void CreateVirtualDirectory(string nameDirectory,string realPath)
{
    DirectoryEntry folderRoot = _iisServer.Children.Find("Root",VirDirSchemaName);

    try
    {
        DirectoryEntry newVirDir = folderRoot.Children.Add(nameDirectory,VirDirSchemaName);
        // Set Properties
        newVirDir.Properties["AccessRead"].Add(true);
        newVirDir.Properties["Path"].Add(realPath);
        // Create a Application
        newVirDir.Invoke("AppCreate",true);
        // Save Changes
        newVirDir.CommitChanges();
        folderRoot.CommitChanges();
        _iisServer.CommitChanges();
    }
    catch (Exception e)
    {
        throw new Exception("Virtual Directory " + nameDirectory + " Already Exists",e);
    }
}