fakhravari
جمعه 19 آبان 1391, 13:21 عصر
ببین.
<form id="form1" runat="server">
<asp:ScriptManager ID="ScriptManager1" runat="server">
</asp:ScriptManager>
<asp:UpdatePanel ID="UpdatePanel1" runat="server">
<ContentTemplate>
<asp:DropDownList ID="DropDownList1" runat="server" AutoPostBack="True"
onselectedindexchanged="DropDownList1_SelectedIndexChanged">
</asp:DropDownList>
<br />
<br />
<asp:DropDownList ID="DropDownList2" runat="server">
</asp:DropDownList>
</ContentTemplate>
</asp:UpdatePanel>
</form>
public static System.Data.DataTable ostan = new System.Data.DataTable();
public static System.Data.DataTable shahr = new System.Data.DataTable();
protected void Page_Load(object sender, EventArgs e)
{
if (!IsPostBack)
{
DropDownList1.Items.Clear();
DropDownList2.Items.Clear();
ostan.Columns.Add("id");
ostan.Columns.Add("name");
ostan.Rows.Add("1", "بوشهر");
ostan.Rows.Add("2", "اهواز");
shahr.Columns.Add("id");
shahr.Columns.Add("name");
shahr.Rows.Add("1", "بوشهر");
shahr.Rows.Add("1", "گناوه");
shahr.Rows.Add("1", "دیلم");
shahr.Rows.Add("1", "جم");
shahr.Rows.Add("1", "گناوه");
shahr.Rows.Add("2", "اهواز");
shahr.Rows.Add("2", "بهبهان");
shahr.Rows.Add("2", "ماهشهر");
ostan.AcceptChanges();
shahr.AcceptChanges();
for (int i = 0; i < ostan.Rows.Count; i++)
{
DropDownList1.Items.Add(new ListItem(ostan.Rows[i]["name"].ToString(), ostan.Rows[i]["id"].ToString()));
}
DropDownList1_SelectedIndexChanged(null, null);
}
}
protected void DropDownList1_SelectedIndexChanged(object sender, EventArgs e)
{
DropDownList2.Items.Clear();
for (int i = 0; i < shahr.Rows.Count; i++)
{
if (DropDownList1.SelectedValue == shahr.Rows[i]["id"].ToString())
{
DropDownList2.Items.Add(new ListItem(shahr.Rows[i]["name"].ToString(), shahr.Rows[i]["id"].ToString()));
}
}
}