Asp.net

protected void btnCreate_Click(object sender, EventArgs e)     {         try         {             server = txtServer.Text.ToString();             database = txtData.Text.ToString();             userid = txtUser.Text.ToString();             password = txtPassword.Text.ToString();             try             {                 System.Configuration.Configuration config = System.Web.Configuration.WebConfigurationManager.OpenWebConfiguration("~");                 System.Configuration.KeyValueConfigurationElement setting = config.AppSettings.Settings["MyValue"];                 if (null != setting)          ...