如何将一个下拉列表绑定到其他drpdown列表 [英] how to bind one dropdownlist to other drpdown list
本文介绍了如何将一个下拉列表绑定到其他drpdown列表的处理方法,对大家解决问题具有一定的参考价值,需要的朋友们下面随着小编来一起学习吧!
问题描述
如何将一个下拉列表绑定到其他drpdown列表
how to bind one dropdownlist to other drpdown list
推荐答案
尝试一下:
Try this :
Make First Dropdown box Autopost Back Property True:
private void FillDropDownList1()
{
DataSet ds = new DataSet();
SqlDataAdapter myda = new SqlDataAdapter("select field1 from tablename",connection;
myda.Fill(ds);
dr1.items.clear(); //added
dr1.DataSource = ds;
dr1.DataTextField = "field1"; //added
dr1.DataValueField = "field1";
dr1.DataBind();
}
put this on Page load:
if (!IsPostBack)
{
FillDropDownList1();
}
now, double click on first dropdown:
protected void dr1_SelectedIndexChanged(object sender, EventArgs e)
{
DataSet ds = new DataSet();
SqlDataAdapter myda = new SqlDataAdapter("select field1 from tablename where column1=''"+dr1.selectedItem.value+"''",connection;
myda.Fill(ds);
dr2.items.clear(); //added
dr2.DataSource = ds;
dr2.DataTextField = "field1"; //added
dr2.DataValueField = "field1";
dr2.DataBind();
}
this will surely help you. otherwise post it.
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