How to Add a User Custom Action for List Items

Steps

• Open Visual Studio in your system.
  
  
• Select Console Application template and give as name.
  
  
• Add a Microsoft.Client Assembly reference file in right side reference tab in visual studio.
  
  
• Replace Program.cs with the source code.
  

  using System;
  using Microsoft.SharePoint.Client;
  
  namespace Microsoft.SDK.SharePointServices.Samples
  {
      class CreateUserCustomActionList
      {
          static void Main()
          {
              string urlWebsite = "http://gauti.sharepoint.com/sites/gp";
              ClientContext clientContext = new ClientContext(urlWebsite);
              Web oWebsite = clientContext.Web;
  
              List oList = oWebsite.Lists.GetByTitle("TestList");
              UserCustomActionCollection collUserCustomAction = oList.UserCustomActions;
  
              UserCustomAction oUserCustomAction = collUserCustomAction.Add();
              oUserCustomAction.Location = "EditControlBlock";
              oUserCustomAction.Sequence = 100;
              oUserCustomAction.Title = "My First User Custom Action";
              oUserCustomAction.Url = urlWebsite + @"/_layouts/MyPage.aspx";
              oUserCustomAction.Update();
  
              clientContext.Load(oList,
                  list => list.UserCustomActions);
  
              clientContext.ExecuteQuery();
          }
      }
  }

Hit F5 and check the output.

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