Hi All,

I have a created a dynamic page that displays two columns of data. The first column shows the name and the second is a dropdownlist with their selected configuration(IT, accounting, marketing ect ect).  I have all this working so far but I'm stuck on the SelectedIndexChange event.  Because I'm autogenerating the dropdowns within a foreach statement I'm not sure what dropdowns ID is when the index is changed so I can populate the where clause on my sql update statement.  

Here is the c# code, the only thing i have on the aspx page is a placeholder at the moment.

MappingComm = new SqlDataAdapter("Select TOP 15 m.MappingID as MappingID, m.Title as Title, isnull(m.ConfigID,0) as ConfigID, s.[name] as [Config] From dbo.SDC_TitleMapping m " +
"left outer join _Smdba_._StdCfg_ s on m.configid = s.[sequence] " +
"order by m.title", MappingConn);

//Create Table
Table tblMapping = new Table();
tblMapping.ID = "tblMapping";
tblMapping.BorderWidth = 1;
tblMapping.Width = 450;
tblMapping.BackColor = System.Drawing.Color.WhiteSmoke;
tblMapping.HorizontalAlign = HorizontalAlign.Left;

{
string Title = Convert.ToString(row["Title"]);
string Config = Convert.ToString(row["Config"]);
int MappingID = Convert.ToInt32(row["MappingID"]);
int ConfigID = Convert.ToInt32(row["ConfigID"]);

Label MappingLabel = new Label();
MappingLabel.ID = "MappingLabel" + i;
MappingLabel.Text = Title.ToString();

//Bind Dropdown
SqlConnection conn;
SqlCommand comm;
SqlCommand commStatus;
SqlDataReader reader;
conn = new SqlConnection(connectionstring);

try

conn.Open();
reader = comm.ExecuteReader();
MappingDropdown.DataSource = reader;
MappingDropdown.DataValueField = "Sequence";
MappingDropdown.DataTextField = "Name";
MappingDropdown.DataBind();
}

catch

finally

else

The MappingDropdown_SelectedIndexChanged event only has a messagebox showing "hello" in it, that doesn't fire either. 

Hi,

as far as I understand you have reported two problems:

    1. find out which DDL as triggered the event

    2. the event is not triggered at all

I think you have only one problem related to dinamic control generation. When creating controls dinamically you must ensure that the controls are always created in the same order and that the recreation of controls must be done at OnLoad or earlier in order to make possible event triggering for those controls.

If you follow these requirements you will endup with a set of DDL that are able of triggering the SelectedIndexChanged event.

When you get there you can easilly get the source DDL from the first argument of the event handler using a cast to the expected type.

good coding

I am calling the Mappings() function from the page_load as shown below....still not sure whats going on.  I've never dynamically created dropdowns and tried trying them to s SelectedIndexChange event, so I feel like I'm running through the fog...maybe walking at times ;)

Anyways, thanks nmgomes, any further help would be great, I'm pretty stuck.
Thanks!
Tim

protected void Page_Load(object sender, EventArgs e)
{
   if (!IsPostBack)
   {
      Dropdowns();  //Populates static dropdowns
      Mappings();    //Creates mapping with dynamic dropdowns
   }
}

I made progress!    I have my SelectedIndexChange event firing, I get my dinky "hello" messagebox.  But I still need a little help with a small area.

I'm still very uncertain how to figure out which dropdrown fired the event.  I'm looking to do something like someVar = ddl.SelectedItem.Value;

Any idea's??

Hi Tim,

you should do something like this

private void DropdownList_SelectedIndexChanged(object sender, EventArgs e)
{
    string selectedValue = ((DropdownList)sender).SelectedItem.Value;
}

//Answer
   DropDownList ddl = s as DropDownList;
   System.Windows.Forms.MessageBox.Show(ddl.SelectedItem.Text.ToString());

Hi Tim,

I'm not sure about that but you should always check to see if someone gave you the correct answer and credit those too ( please see my previous answer )

I'm sure both would work, thanks again nmgomes for the help.  I appreciate it,

tim