Adding EventHandler to DropDownList programically

[dtarczynski]

Hello.
Im trying to add new EventHandler to DropDownList programically. Im
doing something like this:

DropDownList ddlCate = new DropDownList();
ddlCate.ID = String.Format(" ddlCategory{0}" , i++);
ddlCate.DataSou rce = tblSub1;
ddlCate.DataTex tField =
tblSub1.Columns["categories_nam e"].ColumnName;
ddlCate.DataVal ueField =
tblSub1.Columns["categories _id"].ColumnName;
Panel1.Controls .Add(ddlCate);
ddlCate.DataBin d();
ddlCate.AutoPos tBack = true;
ddlCate.Selecte dIndexChanged += new
System.EventHan dler(BindCatego ries);

This is BindCategories function:

void BindCategories( object sender, EventArgs e)
{
Response.Write( "Event raised!");

}

but when Im changing value in ddlCate BindCategories are not raised.
Any help?

thanks in advandce
Darek

[Karl Seguin [MVP]]

My guess s that you have your code in a if (!Page.IsPostBa ck){}

since events happen on postback, they need to be setup during postback.
Normally you'd just place the hook during init...

onInit(object source, EventArgs e)
{
ddlCate.Selecte dIndexChanged +=....
}

since it's dynamic, simply put it out side the !Page.IsPostbac k

Karl

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Hello.
Im trying to add new EventHandler to DropDownList programically. Im
doing something like this:

DropDownList ddlCate = new DropDownList();
ddlCate.ID = String.Format(" ddlCategory{0}" , i++);
ddlCate.DataSou rce = tblSub1;
ddlCate.DataTex tField =
tblSub1.Columns["categories_nam e"].ColumnName;
ddlCate.DataVal ueField =
tblSub1.Columns["categories _id"].ColumnName;
Panel1.Controls .Add(ddlCate);
ddlCate.DataBin d();
ddlCate.AutoPos tBack = true;
ddlCate.Selecte dIndexChanged += new
System.EventHan dler(BindCatego ries);

This is BindCategories function:

void BindCategories( object sender, EventArgs e)
{
Response.Write( "Event raised!");

}

but when Im changing value in ddlCate BindCategories are not raised.
Any help?

thanks in advandce
Darek

[dtarczynski]

Thanks for respose, but mayby you can answer me in more detail. Look
Karl. I have one DropDownList ddlCategories (I create it with
designer), then I have added code for SelectedItemInd exChanged. I have
to create another DropDownList when ddlCategories
SelectedItemInd exChanged is raised. All my code looks like this:

protected void Page_Load(objec t sender, EventArgs e)
{
}

protected void ddlCategories_S electedIndexCha nged(object sender,
EventArgs e)
{

if (...)
{
int i = 0;
DropDownList ddlCate = new DropDownList();
ddlCate.ID = String.Format(" ddlCategory{0}" , i++);
ddlCate.DataSou rce = tblSub1;
ddlCate.DataTex tField =
tblSub1.Columns["categories_nam e"].ColumnName;
ddlCate.DataVal ueField =
tblSub1.Columns["categories _id"].ColumnName;
pnlCat.Controls .Add(ddlCate);
ddlCate.DataBin d();
ddlCate.AutoPos tBack = true;
ddlCate.Selecte dIndexChanged += new
System.EventHan dler(BindCatego ries);
}
}

void BindCategories( object sender, EventArgs e)
{
Response.Write( "Event raised!");

}

Can you answer me, how to properly add this event handler please?

Karl Seguin [MVP] napisal(a):

My guess s that you have your code in a if (!Page.IsPostBa ck){}

since events happen on postback, they need to be setup during postback.
Normally you'd just place the hook during init...

onInit(object source, EventArgs e)
{
ddlCate.Selecte dIndexChanged +=....
}

since it's dynamic, simply put it out side the !Page.IsPostbac k

Karl