Simple DropDownLisT Example

[mansi sharma]

There are two dropDownLists on my form. In one DropDownList items
are-
1)BE
2)Drawing
3)PG

I want if a user selects BE in dropdownlist3 then in dropDownlist4 items are
IT, CSE, MECH

I want if a user selects Drawing in dropdownlist3 then in dropDownlist4 items are
Drawing1, Drawing2

I want if a user selects PG in dropdownlist3 then in dropDownlist4 items are
MBA, MSC, MCA

I do the foll. coding,but errors are there--
Check it out--

public partial class _Default : System.Web.UI.Page
{
protected void Page_Load(object sender, EventArgs e)
{
DropDownList1.Items.Clear();
DropDownList3.Items.Add("BE");
DropDownList3.Items.Add("Drawing");
DropDownList3.Items.Add("PG");
}
protected void DropDownList3_SelectedIndexChanged(object sender, EventArgs e)
{
if (DropDownList3.SelectedItem =="BE")
{
DropDownList4.Items.Clear();
DropDownList4.Items.Add("IT");
DropDownList4.Items.Add("CSE");
DropDownList4.Items.Add("MECH");
}
else if (DropDownList3.SelectedItem =="Drawing")
{
DropDownList4.Items.Clear();
DropDownList4.Items.Add("Drawing 1");
DropDownList4.Items.Add("Drawing 2");
}
else
{
DropDownList4.Items.Clear();
DropDownList4.Items.Add("MBA");
DropDownList4.Items.Add("MSC");
DropDownList4.Items.Add("MCA");

}
}
}

[a496761]

What's your error? I'm guessing it is because you are comparing a listitem to a string. Instead of .SelectedItem try .SelectedItem.Text or .SelectedValue.

[mansi sharma]

If I m using the Selected Item errore are there,if instead of item I use Selected Value,no errors are there,but when i select in any item in Dropdownlist3, in dropdownlist4 no item is displayed....

[mprodge]

Hi Mansi,

write the statement to display the dropdown.

[sierrainfo]

try this in the Load event, it should solve your problem:

protected void Page_Load(object sender, EventArgs e)
{
if (!IsPostBack) 
{
DropDownList1.Items.Clear();
DropDownList3.Items.Add("BE");
DropDownList3.Items.Add("Drawing");
DropDownList3.Items.Add("PG");
}
}

Regards
Sunil Punjabi
<URL Snipped>

[anilMAN]

Drop down list to choose type of :Reader NFC/RFID reader
when user choose reader show description
Description for RFID Reader : Reading range 6-12 Meteres.
Description for NFC Reader : Reading Range 3-5 mm.
can you tell me source code using asp.net