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[QUOTE="ABHIJIT B, post: 3521875"]
Hi Jon,

I did AD authentication in one of my page in ASP.NET 2.0 , you can
find same in 1.1

/// <summary>
    /// This will get user list.
    /// </summary>
    protected bool GetSearchUserData()
    {
        try
        {
            //Bind Search UserList grid  as per user entered

string loginName = txtSULoginName.Text;
            string firstName = txtSUFirstName.Text;
            string lastName = txtSULastName.Text;

string ActiveDirectoryServer =
Convert.ToString(ConfigurationManager.AppSettings["ActiveDirectoryServer"]);

// User that can access domain user details
            string ADUserName =
Convert.ToString(ConfigurationManager.AppSettings["ADUserName"]);
            string ADUserPassword =
Convert.ToString(ConfigurationManager.AppSettings["ADUserPassword"]);

DirectoryEntry entry = new
DirectoryEntry(ActiveDirectoryServer, ADUserName, ADUserPassword);
            DirectorySearcher ds = new DirectorySearcher(entry);

ds.Filter = "(&(objectClass=user)(objectClass=person))";
            if (loginName != "")
            {
                ds.Filter = ds.Filter.Remove(ds.Filter.Length - 1, 1);
                ds.Filter += "(sAMAccountName=" + loginName.Trim() +
"*))";
            }
            if (firstName != "")
            {
                ds.Filter = ds.Filter.Remove(ds.Filter.Length - 1, 1);
                ds.Filter += "(givenName=" + firstName.Trim() + "*))";
            }
            if (lastName != "")
            {
                ds.Filter = ds.Filter.Remove(ds.Filter.Length - 1, 1);
                ds.Filter += "(sn=" + lastName.Trim() + "*))";
            }

dtSearchUserList.Columns.Clear();
            dtSearchUserList.Columns.Add(new DataColumn("LoginName",
typeof(string)));
            dtSearchUserList.Columns.Add(new DataColumn("FirstName",
typeof(string)));
            dtSearchUserList.Columns.Add(new DataColumn("LastName",
typeof(string)));

foreach (SearchResult sr in ds.FindAll())
            {
                DataRow row = dtSearchUserList.NewRow();
                string name = sr.Properties["Name"][0].ToString();
                string firstname = "";
                string lastname = "";

if (name.Length == 0)
                {
                    firstname = "";
                    lastname = "";
                }
                else if (name.IndexOf(",") != -1)
                {
                    iActualLength = name.Length;
                    iLength = name.IndexOf(",") + 2;

if (iActualLength < iLength)
                    {
                        firstname = "";
                        lastname = name;
                    }
                    else
                    {
                        firstname = name.Substring(name.IndexOf(",") +
2);
                        lastname = name.Substring(0,
name.IndexOf(","));
                    }
                }
                else if (name.IndexOf(" ") != -1)
                {
                    iActualLength = name.Length;
                    iLength = name.IndexOf(" ") + 1;

if (iActualLength < iLength)
                    {
                        firstname = "";
                        lastname = name;
                    }
                    else
                    {
                        lastname = name.Substring(name.IndexOf(" ") +
1);
                        firstname = name.Substring(0, name.IndexOf("
"));
                    }
                }
                else
                {
                    firstname = "";
                    lastname = name;
                }
                row["FirstName"] = firstname.Replace("'", "");
                row["LastName"] = lastname.Replace("'", "");
                row["LoginName"] = sr.Properties["SamAccountName"]
[0].ToString();
                dtSearchUserList.Rows.Add(row);
            }

if (dtSearchUserList != null &&
dtSearchUserList.Rows.Count > 0)
            {
                dtSearchUserList.DefaultView.Sort = "LoginName ASC,
FirstName ASC, LastName ASC";
                dgADUserList.DataSource = dtSearchUserList;
                dgADUserList.DataBind();
                blSUSearchSucess = true;
                lblSUErrorText.Text = "";
            }
            else
            {
                dtSearchUserList.Columns.Clear();
                dtSearchUserList.Columns.Add(new DataColumn("Select",
typeof(string)));
                dtSearchUserList.Columns.Add(new
DataColumn("LoginName", typeof(string)));
                dtSearchUserList.Columns.Add(new
DataColumn("FirstName", typeof(string)));
                dtSearchUserList.Columns.Add(new
DataColumn("LastName", typeof(string)));
                dgADUserList.DataSource = dtSearchUserList;
                dgADUserList.DataBind();
                lblSUErrorText.Text = ErrorLog.GetText("NoUsers");
                blSUSearchSucess = false;
            }
        }
        catch (Exception ex)
        {
            blSUSearchSucess = false;
            TraceSUError.Log("\nAn error occurred while fetching user
details.\nException occurred : " + ex.Message);
            strURL = "ErrorPage.aspx?strErrPageName=SearchUsers.aspx";
            Response.Redirect(strURL, false);
        }

return blSUSearchSucess;
    }

Also you can check login user details,

IIdentity WinId = HttpContext.Current.User.Identity;
                WindowsIdentity wi = (WindowsIdentity)WinId;

strDCHLoginID = wi.Name.Split('\\')[1];
                hidDHLoginID.Value = wi.Name.Split('\\')
[1];

if (ValidLoginUserData(strDCHLoginID)) //check user is
present in Database

Regards,
Abhijit B
[/QUOTE]

Verification