How to: Add "ListItems" to DropDownLists that are binded

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  • Start date Start date
G

Guest

I have binded a dropdownlist control to a data view. I am trying to add a
listitem to this already binded control, however, i cannot figure this out.
My code is:

// code to create data view object (dv)

DropDownList1.DataSource = dv;
DropDownList1.DataMember = "vStA";
DropDownList1.DataTextField = "vStAText";
DropDownList1.DataValueField = "vStAId";
if (bNewQuestion)
{
DropDownList1.Items.Insert(0, (new ListItem(" ---- ", "")));
DropDownList1.SelectedIndex = 0;
}

Is it simply not possible to add ListItems to already binded controls? Or is
it my code?

Thanks!
 
You might want to try something like this

for (int i=0;i<=dv.Tables["Table"].rows.count-1;i++)
{
ListItem li=new ListItem();
li.DataTextField=dv.tables["table"].rows["ColumnName"];
li.DataValueField=dv.tables["table"].rows["ColumnName"];
DropDownList1.items.add(li);
}

This method doesn't bind the data to the control and you should be able to
add values later using the same method.

Good Luck.
 
For some reason this is not working either. I have this code inserted w/in a
switch block, which appears to be causing the problem... although i cannot
see how.

Using VS.NET, the intellisense doesn't automatically recognize the ListItem
when instatiated with the "new" key word. However, when i create the ListItem
"outside" the switch block, intellisense automatically recognizes the
ListItem object immediately right typing the "new" constructor to instantiate
it.

I know this makes no sense. Maybe it's a bug w/ my VS.NET?

ED_C# said:
You might want to try something like this

for (int i=0;i<=dv.Tables["Table"].rows.count-1;i++)
{
ListItem li=new ListItem();
li.DataTextField=dv.tables["table"].rows["ColumnName"];
li.DataValueField=dv.tables["table"].rows["ColumnName"];
DropDownList1.items.add(li);
}

This method doesn't bind the data to the control and you should be able to
add values later using the same method.

Good Luck.


charliewest said:
I have binded a dropdownlist control to a data view. I am trying to add a
listitem to this already binded control, however, i cannot figure this
out.
My code is:

// code to create data view object (dv)

DropDownList1.DataSource = dv;
DropDownList1.DataMember = "vStA";
DropDownList1.DataTextField = "vStAText";
DropDownList1.DataValueField = "vStAId";
if (bNewQuestion)
{
DropDownList1.Items.Insert(0, (new ListItem(" ---- ", "")));
DropDownList1.SelectedIndex = 0;
}

Is it simply not possible to add ListItems to already binded controls? Or
is
it my code?

Thanks!
Click to expand...
Click to expand...
 
FYI:

I was able to make my code work (the original code) by creating and
inserting the new ListItem "AFTER" calling the DataBind() method on the drop
down list control.

ED_C# said:
You might want to try something like this

for (int i=0;i<=dv.Tables["Table"].rows.count-1;i++)
{
ListItem li=new ListItem();
li.DataTextField=dv.tables["table"].rows["ColumnName"];
li.DataValueField=dv.tables["table"].rows["ColumnName"];
DropDownList1.items.add(li);
}

This method doesn't bind the data to the control and you should be able to
add values later using the same method.

Good Luck.


charliewest said:
I have binded a dropdownlist control to a data view. I am trying to add a
listitem to this already binded control, however, i cannot figure this
out.
My code is:

// code to create data view object (dv)

DropDownList1.DataSource = dv;
DropDownList1.DataMember = "vStA";
DropDownList1.DataTextField = "vStAText";
DropDownList1.DataValueField = "vStAId";
if (bNewQuestion)
{
DropDownList1.Items.Insert(0, (new ListItem(" ---- ", "")));
DropDownList1.SelectedIndex = 0;
}

Is it simply not possible to add ListItems to already binded controls? Or
is
it my code?

Thanks!
Click to expand...
Click to expand...
 
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