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<asp:DropDownList ID="ddl_FenLei" runat="server" DataSourceID="SqlDataSource1"
DataTextField="tyFenLei" DataValueField="tyFenLei">
</asp:DropDownList>
<asp:DropDownList ID="DropDownList2" runat="server">
<asp:ListItem>1</asp:ListItem>
<asp:ListItem>2</asp:ListItem>
<asp:ListItem>3</asp:ListItem>
<asp:ListItem>4</asp:ListItem>
</asp:DropDownList>
for (int i = 0; i < DropDownList2.Items.Count; i++)
{
if (DropDownList2.Items[i].Text.ToString().Trim() == dl_ddl2.ToString().Trim())
{
DropDownList2.Items[i].Selected = true;
break;
}
}
for (int i = 0; i < ddl_FenLei.Items.Count; i++)
{
if (ddl_FenLei.Items[i].Text.ToString().Trim() == dl_FenLei.ToString().Trim())
{
ddl_FenLei.SelectedIndex = i;
break;
}
}
<asp:DropDownList ID="ddl_FenLei" runat="server" DataSourceID="SqlDataSource1"
DataTextField="tyFenLei" DataValueField="tyFenLei">
</asp:DropDownList>
SqlDataReader r1 = cmd.ExecuteReader();
if (r1.Read())
{
string dl_FenLei;
dl_FenLei = r1["NumFenlei"].ToString();
ListItem litem = ddl_FenLei.Items.FindByText(dl_FenLei);
if (litem != null)
{
litem.Selected = true;
}