我记下了这段代码，试图将其测试SQL字符串连接，但是我不知道该如何处理该部分，connection.Open = true请您帮我解决一下吗？非常感谢您的参与。

  private void button1_Click(object sender, EventArgs e)
    {
        try
        {
            using (SqlConnection connection = new SqlConnection("Data Source='" + textBox1.Text + "';Initial Catalog='" + textBox2.Text + "';User ID='" + textBox3.Text + "';Password='" + textBox4.Text + "'"))
            {
                try
                {
                    connection.Open();
                    if (connection.Open == true) // if connection.Open was successful
                    {
                        MessageBox.Show("You have been successfully connected to the database!");
                    }
                    else
                    {
                        MessageBox.Show("Connection failed.");
                    }
                }
                catch (SqlException) { }
            }
        }
        catch (Exception ex)
        {
            MessageBox.Show("Chyba v p艡ihl谩拧en铆: " + ex);
        }
        finally
        {

        }
    }

它说：“因为它是一个’方法组’，所以不能指定’open’。”我知道这段代码可能很糟糕，但是我需要以某种方式进行处理，并且不知道正确的方法是什么。谢谢你。

这对于未打开的连接实际上不起作用：

using (SqlConnection connection = new SqlConnection("Data Source='" + textBox1.Text + "';Initial Catalog='" + textBox2.Text + "';User ID='" + textBox3.Text + "';Password='" + textBox4.Text + "'"))
        {

             connection.Open();

            if (connection.State == ConnectionState.Open)
            {

                MessageBox.Show("Spojen铆 s datab谩zi probl臎hlo 煤sp臎拧n臎.");
            }
            connection.Close();
            if (connection.State == ConnectionState.Closed)
            {
                MessageBox.Show("Spojen铆 selhalo");
            }
        }