http://localhost:8732/Design_Time_Addresses/aspnetwcf/IService/mex 

Failed to generate a user instance of SQL Server due to failure in retrieving the user's local application data path.
 Please make sure the user has a local user profile on the computer. The connection will be closed.

public void connectToDB()
        {
            string connstring = @"Data Source=asdf\SQLEXPRESS;AttachDbFilename= C:\Users\Александр\Desktop\External (35)\External (5)\App_Data\ASPNETDB.MDF; User ID=asdf\Александр;Password=12345;Integrated Security=SSPI;User Instance = true";
              SqlConnection cn = new SqlConnection(connstring);
            return cn;
                 }
        public ArticleDetails GetArticle()
        {
           using (SqlConnection dbConn = connectToDB())
            {    dbConn.Open();
                String command = "Select * From tbh_Articles Where ArticleID=8";
                SqlCommand cmd = new SqlCommand(command, dbConn);
                SqlDataReader reader = cmd.ExecuteReader();
                if (reader.Read())
                {
                    ArticleDetails art = new ArticleDetails(
                        (int)reader["ArticleID"],
                        (DateTime)reader["AddedDate"],
                        reader["AddedBy"].ToString());
                    return art;
                }
                else
                    return null;
            }

[ServiceContract]
 public interface IService
    {
        [OperationContract]
         ArticleDetails GetArticle();

    }
    [DataContract]
     public class ArticleDetails
     {

authentication mode="Windows" />
    <identity impersonate="true"
             userName="Александр"
password="12345"/>
    <authorization>
    <allow users="?" /> 
</authorization>