public static IList<EditingTemplate> GetTemplates( 
   MapMember mapMember
)

ArcGIS.Desktop.Framework.Threading.Tasks.QueuedTask.Run(() =>
{
  var map = ArcGIS.Desktop.Mapping.MapView.Active.Map;
  if (map == null)
    return;
  //Get a particular table template
  var tableTemplate = map.FindStandaloneTables("Address Points").FirstOrDefault()?.GetTemplate("Residences");
  //Get all the templates of a standalone table
  var ownersTableTemplates = map.FindStandaloneTables("Owners").FirstOrDefault()?.GetTemplates();
  var statisticsTableTemplates = MapView.Active.Map.GetStandaloneTablesAsFlattenedList().First(l => l.Name.Equals("Trading Statistics")).GetTemplates();
});

// Get the first template - alternatively get a specific template
var template = templates.First();

// Activate the default tool
template.ActivateDefaultToolAsync();

// DAML ID of the tool to activate - for example "esri_editing_SketchTwoPointLineTool" Pro Tool or a custom tool
string _editToolname = "esri_editing_SketchTwoPointLineTool";

// Get the first template - alternatively get a specific template
var template = templates.First();

// Confirm the tool is available in the template
if (template.ToolIDs.FirstOrDefault(_editToolname) == null)
  return;

// Activate the tool
template.ActivateToolAsync(_editToolname);

// Get the first template - alternatively get a specific template
var template = templates.First();

// Activate the last selected/used tool for the template
template.ActivateLastSelectedToolAsync();

// Get the first template - alternatively get a specific template
var template = templates.First();

// Activate the template without changing the current tool
template.ActivateAsync();

QueuedTask.Run(() =>
{
  //hide all tools except line tool on layer
  var featLayer = MapView.Active.Map.FindLayers("Roads").First();

  var editTemplates = featLayer.GetTemplates();
  var newCIMEditingTemplates = new List<CIMEditingTemplate>();

  foreach (var et in editTemplates)
  {
    //initialize template by activating default tool
    et.ActivateDefaultToolAsync();
    var cimEditTemplate = et.GetDefinition();
    //get the visible tools on this template
    var allTools = et.ToolIDs.ToList();
    //add the hidden tools on this template
    allTools.AddRange(cimEditTemplate.GetExcludedToolIDs().ToList());
    //hide all the tools then allow the line tool
  
    //At 2.x -
    //allTools.AddRange(cimEditTemplate.GetExcludedToolDamlIds().ToList());
    allTools.AddRange(cimEditTemplate.GetExcludedToolIDs().ToList());
    
    //At 2.x - 
    //cimEditTemplate.SetExcludedToolDamlIds(allTools.ToArray());
    //cimEditTemplate.AllowToolDamlID("esri_editing_SketchLineTool");
    
    cimEditTemplate.SetExcludedToolIDs(allTools.ToArray());
    cimEditTemplate.AllowToolID("esri_editing_SketchLineTool");
    newCIMEditingTemplates.Add(cimEditTemplate);
  }
  //update the layer templates
  var layerDef = featLayer.GetDefinition() as CIMFeatureLayer;
  // Set AutoGenerateFeatureTemplates to false for template changes to stick
  layerDef.AutoGenerateFeatureTemplates = false;
  layerDef.FeatureTemplates = newCIMEditingTemplates.ToArray();
  featLayer.SetDefinition(layerDef);
});