C# 怎么让winform程序中的输入文本框保留上次的输入

选中TextBox控件，在属性窗格中找到(ApplicationSettings)，然后设置它。

绑定配置文件

        private Settings settings = new Settings();

        private void MainForm_Load(object sender, EventArgs e)
        {
            this.txtTargetInitialCatalog.Text = settings.sadbname;
        }

        private void MainForm_FormClosing(object sender, FormClosingEventArgs e)
        {
            settings.sadbname = this.txtTargetInitialCatalog.Text;
            settings.Save();
        }