Multiple Calls to DropDownList SelectedIndexCh ange event

[Paul C]

Can anyone tell me why I am getting 2 calls to my SelectedIndexCh ange
event.

public class Browse : System.Web.UI.P age
{
protected System.Web.UI.W ebControls.Data Grid DataGrid1;
protected System.Web.UI.W ebControls.Drop DownList DropDownConf;
protected DataSet BrowseOrders=nu ll;
protected int ConfID;
private void Page_Load(objec t sender, System.EventArg s e)
{

if ( Session["ConfID"]==null)
Session["ConfID"] = 3;
if (!IsPostBack)
{
BindData(null);
}
//Conference Dropdown Menu
DataSet conferences = RegCache.Confer enceList();
DropDownConf.Da taTextField = "ConfName";
DropDownConf.Da taValueField = "ConfID";
DropDownConf.Da taSource = conferences;
DropDownConf.Da taBind();

ListItem item = new ListItem("- Choose Conference -", "");
DropDownConf.It ems.Insert(0,it em);
}
private void BindData (string orderBy)
{
ConfID = Convert.ToInt32 (Session["ConfID"]);
orderBy =(orderBy==null )?"OrderID":ord erBy;
DataSet ds = null;
if (ViewState["BrowseData Set"]==null)
{
ds = Data.DataAccess .BrowseOrders(C onfID); //create data set and add
to view state
ViewState.Add(" BrowseDataSet", ds);
ds.Tables[0].DefaultView.So rt=orderBy;
}
else
{
ds=(DataSet)Vie wState["BrowseData Set"]; //get data set from view
state

ds.Tables[0].DefaultView.So rt=orderBy;
}
DataGrid1.DataS ource = ds.Tables[0].DefaultView;
DataGrid1.DataB ind();
}
public void SortDataGrid(Ob ject sender, DataGridSortCom mandEventArgs
e)
{
BindData(e.Sort Expression);

}
#region Web Form Designer generated code
override protected void OnInit(EventArg s e)
{
//
// CODEGEN: This call is required by the ASP.NET Web Form Designer.
//
InitializeCompo nent();
base.OnInit(e);
}

/// <summary>
/// Required method for Designer support - do not modify
/// the contents of this method with the code editor.
/// </summary>
private void InitializeCompo nent()
{
this.DropDownCo nf.SelectedInde xChanged += new
System.EventHan dler(this.DropD ownConf_Selecte dIndexChanged);

this.Load += new System.EventHan dler(this.Page_ Load);

}
#endregion


public void DropDownConf_Se lectedIndexChan ged(object sender,
System.EventArg s e)
{
Session["ConfID"] = DropDownConf.Se lectedItem.Valu e;
ViewState.Remov e("BrowseDataSe t");
BindData(null);
}
}

Thanks,
Paul

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[Angrez Singh]

Hi,

Look at the following code snippet:

private void InitializeCompo nent()
{
this.DropDownCo nf.SelectedInde *xChanged += new

System.EventHan dler(this.DropD *ownConf_Select edIndexChanged) ;
this.Load += new
System.EventHan dler(this.Page_ *Load);
}

Here you are binding your dropdown selected Index Changed event with
the eventhandler. I am afraid that you might have done the same thing
in the corresponding aspx file also. So there are two calls one from
..aspx and other from .aspx.cs file.

Don't know why this happens but it happens only when you write the code
behind using C#. If you use VB.NET then it is intelligent enough to
make this call only once.

HTH,
Regards,
Angrez