Active Directory bulk import using C# Application

Using C# application to import bulk entries in Active Directory

If you want to take the stat while processing the entries of Active Directory then it is must that Active Directory should have more entries so that you can process those entries. But creating the bulk entries (like 10000 users) is not an easy task and also we cannot create entry manually. For this there should be any automated process which will import the entries in Active Directory.

For bulk import I have written this c# code which will create bulk entries in Active directory. Using this code you can insert Organizational Units, Groups, and Users. Also you can add the users to groups as a member.

First Add the below reference in your application

System.DirectoryServices

After adding the reference, add the below namespace to your code.

using System.DirectoryServices;

Code Implementation-

private void btnBulkImport_Click(object sender, EventArgs e)
        {
            string strPostPath = "DC=yourdomain,DC=com";
            //Name of Parent OU where child OU will be created
            string strMainOU = "TestOU";
            //Path to main OU
            string strPath = "LDAP://OU=TestOU,DC=yourdomain,DC=com";

             //Set the values to import bulk import
            int intNoOfOUToCreate = 2;
            int intNoOfGroupsForEachOU = 2;
            int intNoOfUsersForEachOU = 5000;
            int intNoOfMembersForEachGroup = 50;
                                  
            try
            {
                 //Adding OU to Main OU                
                 for (int indexOU = 1; indexOU <= intNoOfOUToCreate; indexOU++)
                {
                    strPath = "LDAP://OU=TestOU,DC=yourdomain,DC=com";

                    DirectoryEntry objDEOU = new DirectoryEntry(strPath);
                     //OU Name
                    string strOUName = "OU" + indexOU.ToString();
                    DirectoryEntry objOU = objDEOU.Children.Add("OU=" + strOUName, "organizationalUnit");
                    objOU.CommitChanges();
                    objDEOU.CommitChanges();

                    ArrayList objUserList = new ArrayList();
                     //Adding Users to recently created OU                 
                     for (int indexUser = 1; indexUser <= intNoOfUsersForEachOU; indexUser++)
                    {
                        strPath = "LDAP://OU=" + strOUName + ",OU=" + strMainOU + "," + strPostPath;
                        DirectoryEntry objDEUser = new DirectoryEntry(strPath);
                          //User Name
                        string strUserName = "User" + indexUser.ToString() + "_" + strOUName;
                        DirectoryEntry objUser = objDEUser.Children.Add("CN=" + strUserName, "user");

                         // User name (domain based)  
                         objUser.Properties["userprincipalname"].Add(strUserName + "@yourdomain.com" );

                         // User name (older systems)  
                         objUser.Properties["samaccountname"].Add(strUserName);

                          // Surname  
                         objUser.Properties["sn"].Add(strUserName + "_LastName");

                         // Forename  
                         objUser.Properties["givenname"].Add(strUserName);

                          // Display name  
                         objUser.Properties["displayname"].Add(strUserName + " " + strUserName + "_LastName");

                         // Description  
                         objUser.Properties["description"].Add(strUserName + "_desc");

                         // E-mail  
                         objUser.Properties["mail"].Add(strUserName +  "@yourdomain.com");

                         objUser.CommitChanges();
                         objDEUser.CommitChanges();

                         //Password
                         objUser.Invoke("SetPassword", new object[] { "second@123" });
                         objUser.CommitChanges();

                         //Adding created user to list
                         objUserList.Add(strUserName);
                    }

                   //Adding Groups to recently created OU    
                     for (int indexGroup = 1; indexGroup <= intNoOfGroupsForEachOU; indexGroup++)
                    {
                        strPath = "LDAP://OU=" + strOUName + ",OU=" + strMainOU + "," + strPostPath;

                        DirectoryEntry objDEGroup = new DirectoryEntry(strPath);
                          // Group Name
                        string strGroupName = "Group" + indexGroup.ToString() + "_" + strOUName;
                        DirectoryEntry group = objDEGroup.Children.Add("CN=" + strGroupName, "group");

                         // Description  
                         group.Properties["description"].Add(strGroupName + "_desc");

                         group.CommitChanges();
                         objDEGroup.CommitChanges();

                         
                          //Adding user to the recenlty created group as member
                        strPath = "LDAP://" + "yourdomain.com/" + "CN=" + strGroupName + ",OU=" + strOUName + ",OU=" + strMainOU + "," + strPostPath;

                         //Adding members to Group
                        ArrayList objGroupUserList = new ArrayList();

                          for (int indexUser = 1; indexUser <= intNoOfMembersForEachGroup; indexUser++)
                         {
                               //Getting random user from List
                            Random rnd = new Random();
                            int randomUser = rnd.Next(1, intNoOfUsersForEachOU);
                            string strGroupUser = Convert.ToString(objUserList[randomUser]);
                              //If user is already exist in group then skip that user
                              if (objGroupUserList.Contains(strGroupUser))
                              {
                                   continue;
                            }

                            string ustr = "CN=" + strGroupUser + ",OU=" + strOUName + ",OU=" + strMainOU + "," + strPostPath;
                            DirectoryEntry ent = new DirectoryEntry(strPath);
                              ent.Properties["member"].Add(ustr);
                              ent.CommitChanges();
                              objGroupUserList.Add(strGroupUser);
                          }
                     }
                 }
                 MessageBox.Show("Process Completed...");
            }
            catch (Exception ex)
            {
                MessageBox.Show (ex.Message ) ;
             }
        }

Description-

In above code I have taken some variables-

            intNoOfOUToCreate - Number of Organization Units to create in Active Directory
            intNoOfGroupsForEachOU - Number of Groups  to create in each OU
            intNoOfUsersForEachOU - Number of Users  to create in each OU
            intNoOfMembersForEachGroup - Number of Users  to add as a member in each Group

Based on given values for these variables for loop will run and it will create the Active Directory structure.

You can download the code from here- Active Directory Bulk Import