hiiii

i have a DropDownList1 that has a data source from a table, and the autopostback is enabled ... the problem is

when DropDownList1 has only one item the event SelectedIndexChanged does not work ..

but in case of 2 items and above it works fine  ........

protected void DropDownList1_SelectedIndexChanged(object sender, EventArgs e)

{Label1.Text = DropDownList1.SelectedItem.Text;}

Off course! You have only one item and it is the one selected!! You should have more than one item to try to change selection and see how the page posts back!

Regards

The way I get around this is to insert a new item at the top of the list to tell the user to make a selection from the list. You would do this after you have bound the dataset from the database to the ListControl.

ddlMyList.Items.Insert(0, new ListItem("Select an Item"))

This forces the user to make a selection from the list.

hii i used this ... but no new items is added to the list

protected void Page_Load(object sender, EventArgs e)

 { DropDownList1.Items.Insert(0, new ListItem("Select Item")); }

 protected void DropDownList1_SelectedIndexChanged(object sender, EventArgs e)

{ Label1.Text = DropDownList1.SelectedItem.Text; }

Note that the dropdown list datasource is Database table not a collection of items ....

Hey amative,

You should simply get into the habit of creating DropDownLists with a default "empty" value.  Empty isn't really the term I would use, but it simply means that the selection of this value can be used in validation and it gives the user an idea as to what the dropdownlist will do for them. 

Create your DropDownList with the following properties:

AppendDataBountItems = true
AutoPostBack = true
DataSourceID = {your datasource name}
DataTextField = {your text column}
DataValueField = {your value column}

Now, immediately add a new item to the dropdownlist (in the gui is fine)... The item should have the following values:

Enabled = true
Selected = true
Text = "Please select a value"
Value = 0

Note that I do not leave the Value property blank; this will not stay blank during the process of building the website... somehow VS.NET 2005 gets the idea that the Value if blank should be changed to the Text value.  So I use ZERO (0) as my value since I know that my datasource will not contain a ZERO value.  Change it to "NOTHING" or something if you need to.

What all this will do for you is allow your DataSource to append to the dropdownlist all of the values.  It also allows you to set validation in your form.  If I use ZERO for the value of my DataValueField I can use a rangevalidator to specifiy the validation fails if not > 0.    Now your selection events will work fine, and you can even check for that value=0 to hide or show other form elements. 

protected void ddl_SelectedIndexChanged(object sender, EvenArgs e)
{
if (ddl.SelectedValue !- "0")
{
      btnNew.Enabled = true;
      formviewUserControls.DefaultMode = FormViewMode.ReadOnly;

}
else
{
      btnNew.Enabled = true;
}
}

Wil

hiiiiii

thanx for ur reply ...

i tried your way ... but unfortunately its not working ... i did not succeed in adding new item to the DDL its only

filled with the DataSource items ...

It is not working because it looks like you are releading your dropdown list each time the page is loaded. you need to check the IsPostback = false then bind the list to the control, then the empty item.

Page_Load

   If IsPostback then

     BindDDLData()

   end if

end sub

sub      BindDDLData()

ddl.datasource = XYZ

ddl.BindData

ddl.items.insert(0, new ListItem) 

end sub

Hello friend,

try the following

public partial class BindDataList : System.Web.UI.Page
{
    protected void Page_Load(object sender, EventArgs e)
    {
        if (!IsPostBack)
            BindDropDownList();

    }
    void BindDropDownList()
    {
        string connect = "Data Source=localhost\\sqlexpress;Initial Catalog=pubs;Integrated Security=True;";
        System.Data.SqlClient.SqlConnection sqlconnect = new System.Data.SqlClient.SqlConnection(connect);
        string command = "select job_desc from jobs";
        System.Data.SqlClient.SqlCommand sqlcommand = new System.Data.SqlClient.SqlCommand();
        sqlcommand.CommandText = command;
        sqlcommand.Connection = sqlconnect;

        System.Data.SqlClient.SqlDataAdapter da = new System.Data.SqlClient.SqlDataAdapter();
        da.SelectCommand = sqlcommand;
        DataSet ds = new DataSet();

        sqlconnect.Open();
        sqlcommand.ExecuteNonQuery();
        da.Fill(ds);
        DropDownList1.DataTextField = "job_desc";
        DropDownList1.DataValueField = "job_desc";
        DropDownList1.DataSource = ds;
        DropDownList1.DataBind();
        DropDownList1.Items.Insert(0, new ListItem("-SELECT-"));
        sqlconnect.Close();
    }
  }

hope it helps,

Jessica

amative:

 Hi friend r u still having this problem.

friend if u still facing problem-

right click drop down list and select edit items --> Enter any text and click OK

 
then change the  

AppendDataBoundItem  Property to True

 Hope this helps you.

hiiii

i have a DropDownList1 that has a data source from a table, and the autopostback is enabled ... the problem is

when DropDownList1 has only one item the event SelectedIndexChanged does not work ..

but in case of 2 items and above it works fine  ........

protected void DropDownList1_SelectedIndexChanged(object sender, EventArgs e)

{Label1.Text = DropDownList1.SelectedItem.Text;}