IFeatureLayer pFeLayer = axMapControl1.get_Layer(0) as IFeatureLayer;
  IDataLayer idata = pFeLayer as IDataLayer;
  IDatasetName idataname = idata.DataSourceName as IDatasetName;
  string path = idataname.WorkspaceName.PathName;


  Geoprocessor gp = new Geoprocessor();
  gp.OverwriteOutput = true;
  gp.SetEnvironmentValue("workspace", path);
  CollectEvents collect = new CollectEvents(); collect.Input_Incident_Features = pFeLayer.FeatureClass;
  collect.Output_Weighted_Point_Feature_Class = @"E:\collect.shp";
  collect.Z_Max_Value = 10;
  gp.Execute(collect, null)