SampleTool.Helper.ParameterHelper.HasParameter C# (CSharp) Method

        public bool HasParameter(string parameterName)
        {
            Parameter theParam = GetParameterFromProjectInfo(parameterName);
            if (null == theParam)
            {
                return false;
            }

            return true;
        }

        public Result Execute(ExternalCommandData commandData, ref string message, Autodesk.Revit.DB.ElementSet elements)
        {
            IParameterHelper ph = new ParameterHelper(commandData.Application.ActiveUIDocument.Document);

               var paramName = "SomeParameterThatNormallyDoesnotExist";
               var exists = ph.HasParameter(paramName);

               MessageBox.Show(paramName + " exists: " + exists);

             paramName = "Project Name";
             exists = ph.HasParameter(paramName);

             MessageBox.Show(paramName + " exists: " + exists);

            return Result.Succeeded;
        }