如何在用户控件中为标签添加值？

问题描述

嗨！



我有一个注册表，一个登录表和一个主表。该程序从注册表开始。如果我注册数据（名称，电子邮件，密码）加载到本地数据库。当我正确登录显示主窗体。主窗体具有带标签的usercontrol。我想用她/他的名字在标签上写一个欢迎文本。示例：欢迎Josh！。所以我应该识别用户，所以我使用登录表单中的textboxEmail.Text。它没有显示价值。



我尝试过：

Hi!

I have a registration form, a login form and a Main form.The program start with registration form. If i sign up the datas(name, email, password) load up to the local database. When i log in correctly show the main form. The main form has a usercontrol with a label. I would like to write a welcome text to the label with her/his name. Example: "Welcome Josh!". So I should to identify the user, so i use the textboxEmail.Text from the login form. It don't show the value.

What I have tried:

namespace personalFinance
{
   public partial class Login : Form
      {
        public Login()
         {

            InitializeComponent();
            var MainForm = new MainForm();
            MainForm.Show();
            HomepageUC hp = new
            HomepageUC(textboxEmail.Text);
            hp.Show();
         }
      }

}





public partial class HomepageUC : UserControl
{
   string login = "";

   public HomepageUC()
   {
       InitializeComponent();
   }

   public HomepageUC(string email): this()
      {
       login = email;
        var conn = new SqlConnection(@"Server=(localdb)\MSSQLLocalDB;
        AttachDbFileName=|DataDirectory|database.mdf;");
        conn.Open();
         try
            {
              conn.Open();
              var cmd = new SqlCommand($"SELECT name FROM registration_data WHERE email = '{login}'", conn);
               var reader = cmd.ExecuteReader();
               while (reader.Read()) labelWelcome.Text = reader[0].ToString();
            }

            finally
            {
                conn.Close();
            }
      }
 }

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