My code to load a DropDownList is shown below. Yet when I load the
page after a postback there is no zeroth item present.
lstManager.Items.Clear();
lstManager.DataSource = _dsData.Tables["manager"].DefaultView;
lstManager.DataValueField = "ManagerID";
lstManager.DataTextField = "Name";
lstManager.DataBind();
lstManager.Items.Insert(0, new ListItem("none", "0"));
There's nothing special about the control definition:
<asp:DropDownList ID="lstManager" runat="server" Height="20px"
Width="250px" />
What's going on here?
This was the old code I replaced. Why does the old code (below) work
and why is my new code (above) broke?
lstManager.Items.Clear();
ListItem li = new ListItem("none","0");
lstManager.Items.Add(li);
foreach (DataRow drManager in _dsData.Tables["manager"].Rows)
{
ListItem liManager = new ListItem((string)drManager["Name"],
((int)drManager["ManagerID"]).ToString());
lstManager.Items.Add(liManager);
}I had this one a while back; turns out I was using simple properties
on a Master Page that required a DataBind() call to bind them. When
it was called, it was also rebinding the content page, which loses the
manually added items.
I recall this issue also happened with an ASCX file on the page, or if
you call a generic DataBind() any time after the addition of
ListItems, etc.
Dunc
http://www.fluidfoundation.com
On 1 Jun, 15:24, mark4asp <mark4...@.gmail.comwrote:
Quote:
Originally Posted by
The first intem in a DropDownList is vanishing!
>
My code to load a DropDownList is shown below. Yet when I load the
page after a postback there is no zeroth item present.
>
lstManager.Items.Clear();
>
lstManager.DataSource = _dsData.Tables["manager"].DefaultView;
lstManager.DataValueField = "ManagerID";
lstManager.DataTextField = "Name";
lstManager.DataBind();
>
lstManager.Items.Insert(0, new ListItem("none", "0"));
>
There's nothing special about the control definition:
>
<asp:DropDownList ID="lstManager" runat="server" Height="20px"
Width="250px" />
>
What's going on here?
>
This was the old code I replaced. Why does the old code (below) work
and why is my new code (above) broke?
>
lstManager.Items.Clear();
>
ListItem li = new ListItem("none","0");
lstManager.Items.Add(li);
>
foreach (DataRow drManager in _dsData.Tables["manager"].Rows)
{
ListItem liManager = new ListItem((string)drManager["Name"],
((int)drManager["ManagerID"]).ToString());
lstManager.Items.Add(liManager);
}
On 1 Jun, 16:30, Dunc <duncan.we...@.gmail.comwrote:
Quote:
Originally Posted by
I had this one a while back; turns out I was using simple properties
on a Master Page that required a DataBind() call to bind them. When
it was called, it was also rebinding the content page, which loses the
manually added items.
>
I recall this issue also happened with an ASCX file on the page, or if
you call a generic DataBind() any time after the addition of
ListItems, etc.
>
Dunchttp://www.fluidfoundation.com
>
On 1 Jun, 15:24, mark4asp <mark4...@.gmail.comwrote:
>
>
>
Quote:
Originally Posted by
The first intem in a DropDownList is vanishing!
>
Quote:
Originally Posted by
My code to load a DropDownList is shown below. Yet when I load the
page after a postback there is no zeroth item present.
>
Quote:
Originally Posted by
lstManager.Items.Clear();
>
Quote:
Originally Posted by
lstManager.DataSource = _dsData.Tables["manager"].DefaultView;
lstManager.DataValueField = "ManagerID";
lstManager.DataTextField = "Name";
lstManager.DataBind();
>
Quote:
Originally Posted by
lstManager.Items.Insert(0, new ListItem("none", "0"));
>
Quote:
Originally Posted by
There's nothing special about the control definition:
>
Quote:
Originally Posted by
<asp:DropDownList ID="lstManager" runat="server" Height="20px"
Width="250px" />
>
Quote:
Originally Posted by
What's going on here?
>
Quote:
Originally Posted by
This was the old code I replaced. Why does the old code (below) work
and why is my new code (above) broke?
>
Quote:
Originally Posted by
lstManager.Items.Clear();
>
Quote:
Originally Posted by
ListItem li = new ListItem("none","0");
lstManager.Items.Add(li);
>
Quote:
Originally Posted by
foreach (DataRow drManager in _dsData.Tables["manager"].Rows)
{
ListItem liManager = new ListItem((string)drManager["Name"],
((int)drManager["ManagerID"]).ToString());
lstManager.Items.Add(liManager);
}- Hide quoted text -
>
- Show quoted text -
Thanks Dunc, for sharing that with me - that scenario you described
sounds very like mine.
