省市县三级联动源码

程序介绍：

选择省会，自动关联城市，选择城市制动关联县市

主要代码：
 private void MainForm_Load(object sender, EventArgs e)
        {
            this.cbo_Province.DisplayMember = "Name";
            this.cbo_Province.ValueMember = "Code";
            this.cbo_Province.DataSource = _administrativeDivsionManager.GetALLProvince();
        }
private void cbo_Province_SelectedIndexChanged(object sender, EventArgs e)
        {
            this.cbo_City.DisplayMember = "Name";
            this.cbo_City.ValueMember = "Code";
            this.cbo_City.DataSource = _administrativeDivsionManager.GetCity(this.cbo_Province.SelectedValue.ToString ());
        }
private void cbo_City_SelectedIndexChanged(object sender, EventArgs e)
        {
            this.cbo_Rope.DisplayMember = "Name";
            this.cbo_Rope.ValueMember = "Code";
            this.cbo_Rope.DataSource = _administrativeDivsionManager.GetRope(this.cbo_City.SelectedValue.ToString());
        }

数据库默认放在DB_51aspx文件夹下