Mobile

Hi World!
When i wanna to open layout (Main.axml) in disigner in VS2010 for android I get this error : Xamarin.AndroidDesigner.DesignerException 
But it works correctly in XML Design.
I wanna to have design !

Unhandled Exception CODEPAGE="1256″ not supported

IDbConnection

void button_Click(object sender, EventArgs e)
       {

               TextView txts = FindViewById<TextView>(Resource.Id.txt);
               txts.Text = "Salam Ali Joon !";
               string namess = "";
               string connectionString = "Server=217.66.216.77,1633;" +

                   "Database=testinDB;" + "User ID=testing;" + "Password=arew;";
               try
               {
           IDbConnection dbcon;
               using (dbcon = new SqlConnection(connectionString))
               {
                   dbcon.Open();
                   using (IDbCommand dbcmd = dbcon.CreateCommand())
                   {
                       string sql = " SELECT * " +
                                    " FROM persons.[user] ";
                       dbcmd.CommandText = sql;
                       using (IDataReader reader = dbcmd.ExecuteReader())
                       {
                           while (reader.Read())
                           {
                               string FirstName = (string)reader["UserName"];
                               namess = "user name is : " + FirstName;
                               //string LastName = (string)reader["LastName"];
                               //namess += "Name: " +FirstName + " " + LastName;
                           }
                           reader.Close();
                           dbcon.Close();
                       }
                   }
               }
               txts.Text = namess;
           }
           catch (Exception ex)
           {
               txts.Text = ex.Message;
           }
       }

public void DeletarRegistro (int iId)
        {
            try
            {
                
                if (MessageBox.Show("Confirma exclusão? ", "Excluir", MessageBoxButtons.YesNo) == DialogResult.Yes)
                {
                    sSQLQuery = "DELETE FROM MyTable " + "WHERE _id='" + iId + "';";
                    sqldTemp.ExecSQL(sSQLQuery);
                    sMensagem = "Record is deleted: " + iId;
                    MessageBox.Show("Dados Excluídos com sucesso.");
                }
            }
            catch (SQLiteException ex)
            {
                sMensagem = ex.Message;
            }
        }