My.Computer.Network.IsAvailable() c#

private void Login_Shown(object sender, EventArgs e)
{
if (ClassGenel.Fn_NetworkVar() == false)
{alertControlaLOGIN.Show(this, "Network Bulunamadı", "Sisteme Bağlanamayabilirsiniz!!!");}
else {alertControlaLOGIN.Show(this, "Network Var", "Bağlantı var."); }
}
//ClassGenel ->

internal static bool Fn_NetworkVar() {
clsH24Tools.Tools cls = new clsH24Tools.Tools();
return cls.Fn_NetworkVar();
}
// inside dll ->


Public Class Tools
Public Function Fn_NetworkVar() As Boolean


Return My.Computer.Network.IsAvailable()
End Function

End Class

//and,  see attached pictures