利用Properties-->Settings.settings保存信息

TextBox1.Text=global::网络中心计费系统.Properties.Settings.Default.radiusConnectionString;
这一句是显示类型为连接字符串的如:"server=210.38.240.251;user id=xinxi;database=radius;Password=051;persist security info=True"连接句柄的

 

namespace 网络中心计费系统
{
    public partial class Connection : Form
    {
        网络中心计费系统.Properties.Settings set;
        public Connection()
        {
            InitializeComponent();
            set = new 网络中心计费系统.Properties.Settings();
        }

        
        private void Connection_Load(object sender, EventArgs e)
        {
           //  this.textBox1.Text = global::网络中心计费系统.Properties.Settings.Default.ConnectionString;
           this.textBox1.Text = set.Sourcestring;
            this.textBox2.Text = set.DataBase;
            this.textBox3.Text = set.User;
        
            this.textBox4.Text = set.Password;
            
        }

        private void button1_Click(object sender, EventArgs e)
        {
            MySQLConnection cn = new MySQLConnection(new MySQLConnectionString(this.textBox1.Text.ToString(), this.textBox2.Text.ToString(), this.textBox3.Text.ToString(), this.textBox4.Text.ToString()).AsString);

            try
            {
                cn.Open();
                MessageBox.Show("恭喜,测试连接成功", "温馨提示", MessageBoxButtons.OK, MessageBoxIcon.Information);
            }
            catch
            {
                MessageBox.Show("很遗憾,测试连接失败,请检查", "温馨提示", MessageBoxButtons.OK, MessageBoxIcon.Information);
            }
        }

        private void button2_Click(object sender, EventArgs e)
        { 
            set.Sourcestring = this.textBox1.Text.ToString().Trim(); 
            set.DataBase = this.textBox2.Text.ToString().Trim();
            set.User = this.textBox3.Text.ToString().Trim();
            set.Password = this.textBox4.Text.ToString().Trim();
            set.Save();
            MessageBox.Show("更新成功！请重新运行程序！", "温馨提示", MessageBoxButtons.OK, MessageBoxIcon.Information);
            Application.Exit(); 

        }

        private void button3_Click(object sender, EventArgs e)
        {
            Application.Exit(); 

        }


    }
}