IEnumerable<IGPMessage> ErrorMessages {get;}

var warnings = result.Messages.Where(it => it.Type == GPMessageType.Error);

//The data referenced in this snippet can be downloaded from the arcgis-pro-sdk-community-samples repo
//https://github.com/Esri/arcgis-pro-sdk-community-samples
async Task<IGPResult> CreateRings(EditingTemplate currentTemplate)
      {
          var paramsArray = Geoprocessing.MakeValueArray(currentTemplate.MapMember.Name,
                      @"C:\Data\FeatureTest\FeatureTest.gdb\Points_MultipleRingBuffer",
                      new List<string> { "1000", "2000" }, "Meters", "Distance",
                      "ALL", "FULL");

          IGPResult ringsResult = await Geoprocessing.ExecuteToolAsync("Analysis.MultipleRingBuffer", paramsArray);
          var messages = string.IsNullOrEmpty(gpResult.ReturnValue)
                  ? $@"Error in gp tool: {gpResult.ErrorMessages}"
                  : $@"Ok: {gpResult.ReturnValue}";

          return ringsResult;
      }