txt_ctype.Items.Clear();
DataTable dt= new DataTable();
jeb.BusinessRule.ProductSmallType bll_pst = new jeb.BusinessRule.ProductSmallType(Request);
dt=bll_pst.GetByPBT_NO(this.txt_btype.SelectedValue).Tables[0];
if (dt != null && dt.Rows.Count != 0) {
txt_ctype.Items.Add(\"请选择...\");
for (int i = 0; i < dt.Rows.Count; i++) {
txt_ctype.Items.Add(new ListItem(dt.Rows[i][\"pst_name\"].ToString(),dt.Rows[i][\"pst_no\"].ToString()));
}
} else
{
txt_ctype.Items[0].Text =\"没有选项...\";
}
this.DataBind();
知道这个是干什么吗?哈哈,就是一个数据的绑定到DropDownList里面,然后第一条数据改为:\"请选择\",简单吧