ArcStrabo10.ButtonShowTessdataPrefix.OnClick C# (CSharp) Метод

        protected override void OnClick()
        {
            string tessPath = Environment.GetEnvironmentVariable(ArcStrabo10Extension.EnvironmentVariableTESS_DATA, EnvironmentVariableTarget.User);
            if (!string.IsNullOrEmpty(tessPath))
            {
                ArcMap.Application.CurrentTool = null;
                MessageBox.Show(tessPath);
            }
            else
                MessageBox.Show(ArcStrabo10Extension.ErrorMsgNoTess_Data);
        }