The following example returns all the users from the given SharePoint Site Group using SharePoint Managed Client Side Object Model.
After creating a console application project in Visual Studio solution, add the following assembly references to the project.
Microsoft.SharePoint.Client
Microsoft.SharePoint.Client.Runtime
  1. using Microsoft.SharePoint.Client;
  2. using System;
  3. using System.Collections.Generic;
  4. using System.Linq;
  5. using System.Net;
  6. using System.Text;
  8. namespace GetGroupUsers
  9. {
  10. class Program
  11. {
  12. static void Main(string[] args)
  13. {
  14. //Get Site Url fro user
  15. Console.Write("Enter Site URL: ");
  16. string strURL = Console.ReadLine();
  18. //Get Username from user in the format of (Domain/Login ID)
  19. Console.Write("Enter UserName (domain/userid): ");
  20. string strUserName = Console.ReadLine();
  22. Console.Write("Enter your password: ");
  23. string pass = getPassword();
  24. Console.WriteLine();
  25. RETRY_GROUP:
  26. Console.Write("Enter Group Name: ");
  27. string groupName = Console.ReadLine();
  28. Console.WriteLine();
  30. try
  31. {
  32. ClientContext ctx = new ClientContext(strURL);
  33. ctx.Credentials = new NetworkCredential(strUserName, pass);
  34. Web web = ctx.Web;
  36. Group group = web.SiteGroups.GetByName(groupName);
  38. //Parameters to receive response from the server
  39. ctx.Load(web, w => w.Title);
  40. ctx.Load(group, grp => grp.Title, grp => grp.Users, grp => grp.Owner);
  41. ctx.ExecuteQuery();
  43. Console.WriteLine("Groups Name: " + group.Title);
  44. Console.WriteLine("Users Count: " + group.Users.Count);
  45. Console.WriteLine("Group Owner: " + group.Owner.Title);
  46. Console.WriteLine("Users:");
  47. foreach(User usr in group.Users)
  48. {
  49. Console.WriteLine(usr.Title);
  50. }
  51. }
  52. catch (Exception ex)
  53. {
  54. Console.WriteLine("Error: " + ex.Message);
  55. Console.Write("Do you want to continue (y / n):");
  56. ConsoleKeyInfo boolContinue = Console.ReadKey();
  57. Console.WriteLine();
  58. if (boolContinue.KeyChar == 'y')
  59. goto RETRY_GROUP;
  60. else
  61. Console.Write("Enter to Exit.");
  62. }
  64. Console.Read();
  65. }
  67. private static string getPassword()
  68. {
  69. ConsoleKeyInfo key;
  70. string pass = "";
  71. do
  72. {
  73. key = Console.ReadKey(true);
  74. // Backspace Should Not Work
  75. if (key.Key != ConsoleKey.Backspace && key.Key != ConsoleKey.Enter)
  76. {
  77. pass += key.KeyChar;
  78. Console.Write("*");
  79. }
  80. else
  81. {
  82. if (key.Key == ConsoleKey.Backspace && pass.Length > 0)
  83. {
  84. pass = pass.Substring(0, (pass.Length - 1));
  85. Console.Write("\b \b");
  86. }
  87. }
  88. }
  89. // Stops Receving Keys Once Enter is Pressed
  90. while (key.Key != ConsoleKey.Enter);
  91. return pass;
  92. }
  93. }
  94. }
Supported Versions:

SharePoint 2013 + SharePoint Online