this 在当前上下文不可用？？？

Question

namespace StudentGradeManage.UI
{
    public partial class frmUsercx : Form
    {
        public frmUsercx()
        {
            InitializeComponent();
        }        ctlUsercx objControl = new ctlUsercx();        string Userid = this..txtUserid.Text.Trim();
        string Userpwd = this.cbxUserlevel.SelectedItem.ToString();        private void barButtonItem1_ItemClick(object sender, DevExpress.XtraBars.ItemClickEventArgs e)
        {
            objControl.BingdingData(User, Userpwd, this);
        }
    }
}这是代码，我想取窗体控件里的字符，怎么出错了？？求解！！

Answer 1

如何写，才可以在多个地方调用Userid和Userlevel呢

Answer 2

namespace StudentGradeManage.UI
{
  public partial class frmUsercx : Form
  {
  public frmUsercx()
  {
  InitializeComponent();
  }  ctlUsercx objControl = new ctlUsercx();  string Userid;
  string Userpwd ;  private void barButtonItem1_ItemClick(object sender, DevExpress.XtraBars.ItemClickEventArgs e)
  {           Userid = this..txtUserid.Text.Trim();           Userpwd = this.cbxUserlevel.SelectedItem.ToString();          objControl.BingdingData(User, Userpwd, this);
  }
  }
}这样就可以了

Answer 3

用属性封装即可，不必多此一举...另外，可能为null的值不要乱ToString...public string Userpwd {
get{
return Convert.ToString(this.cbxUserlevel.SelectedItem);
}
}