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http://amycolinbolg.blog.163.com/blog/static/529495302007101015926476/

C# code:

protected void DropDownListPrevious_SelectedIndexChanged(object sender, EventArgs e)
{
List<ʵÌå> list = BLL.GetDropDownListPreviousChecked(Convert.ToInt32(this.DropDownListPrevious.SelectedValue.ToString()));//×Ô¼ºÐ´¸ù¾ÝDropDownListPreviousÑ¡ÖÐÖµµÃϼ¶DropDownListµÄ¼¯ºÏ
this.DropDownListNext.DataSource = list;
if (this.DropDownListPrevious.SelectedIndex == 0)
{
this.DropDownListNext.Items.Clear();
}
else
{
this.DropDownListNext.DataTextField = "Name";//ÒªÏÔʾµÄ×Ö¶ÎÃû
this.DropDownListNext.DataValueField = "Id"; //ÒªÏÔʾµÄ×ֶζÔÓ¦µÄid(Ψһ)
this.DropDownListNext.DataBind();
}
}



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