public class CIMRowTemplate : CIMBasicRowTemplate, System.ComponentModel.INotifyPropertyChanged, System.Xml.Serialization.IXmlSerializable  

await QueuedTask.Run(() =>
      {
        var templateName = "Distribution"; // name of the template to update
        var toolDamlPlugInID = "esri_editing_SketchTwoPointLineTool"; // DAML ID of the tool to set as default
        var toolContentGUID = "e2096d13-b437-4bc1-94ea-4494c3260f72"; // Example GUID, replace with actual GUID from DAML
                                                                      // retrieve the edit template form the layer by name
        var template = featureLayer?.GetTemplate(templateName) as EditingTemplate;
        // get the definition of the layer
        var layerDef = featureLayer?.GetDefinition() as CIMFeatureLayer;
        if (template == null || layerDef == null)
          return;
        if (template.DefaultToolID != toolDamlPlugInID)
        {
          bool updateLayerDef = false;
          if (layerDef.AutoGenerateFeatureTemplates)
          {
            layerDef.AutoGenerateFeatureTemplates = false;
            updateLayerDef = true;
          }

          // retrieve the CIM edit template definition
          var templateDef = template.GetDefinition();

          // assign the GUID from the tool DAML definition, for example
          // <tool id="TestConstructionTool_SampleSDKTool" categoryRefID="esri_editing_construction_polyline" ….>
          //   <tooltip heading="">Tooltip text<disabledText /></tooltip>
          //   <content guid="e58239b3-9c69-49e5-ad4d-bb2ba29ff3ea" />
          // </tool>
          // then the toolContentGUID would be "e58239b3-9c69-49e5-ad4d-bb2ba29ff3ea"

          //templateDef.ToolProgID = toolContentGUID;
          templateDef.DefaultToolGUID = toolContentGUID;

          // set the definition back to 
          template.SetDefinition(templateDef);

          // update the layer definition too
          if (updateLayerDef)
            featureLayer.SetDefinition(layerDef);
        }
      });

await QueuedTask.Run(() =>
   {
     //hide all tools except line tool on a given feature layer
     var editTemplates = featureLayer.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

       allTools.AddRange(cimEditTemplate.GetExcludedToolIDs().ToList());

       cimEditTemplate.SetExcludedToolIDs(allTools.ToArray());
       cimEditTemplate.AllowToolID("esri_editing_SketchLineTool");
       newCIMEditingTemplates.Add(cimEditTemplate);
     }
     //update the layer templates
     var layerDef = featureLayer.GetDefinition() as CIMFeatureLayer;
     // Set AutoGenerateFeatureTemplates to false for template changes to stick
     layerDef.AutoGenerateFeatureTemplates = false;
     layerDef.FeatureTemplates = newCIMEditingTemplates.ToArray();
     featureLayer.SetDefinition(layerDef);
   });

// Creates new table templates for the specified standalone table.
await QueuedTask.Run(() =>
{
  var table = activeMap.GetStandaloneTablesAsFlattenedList().FirstOrDefault();
  var tableTemplate = table.GetTemplate("Template1");

  var definition = tableTemplate.GetDefinition();
  definition.Description = "New definition";
  definition.Name = "New name";
  //Create new table template using this definition
  table.CreateTemplate(definition);

  //You can also create a new table template using this extension method. You can use this method the same way you use the layer.CreateTemplate method.
  table.CreateTemplate("New template name", "Template description", tags: ["tag 1", "tag 2"]);
});

// Updates the definition of a specified table template by modifying its name and description.
var table = activeMap.GetStandaloneTablesAsFlattenedList().FirstOrDefault();
await QueuedTask.Run(() =>
  {
    // get a table template
    var tableTemplate = table.GetTemplate("Template1") ?? throw new Exception("No table template named 'Template1' found");
    // get the definition
    var definition = tableTemplate.GetDefinition();
    definition.Description = "New definition";
    definition.Name = "New name";
    // update the definition
    tableTemplate.SetDefinition(definition);
  });