Question

i have a DropDownList which is getting data from dataset, the dropdownlist show all the data from the dataset perfect, but i want to add an empty value to the list as the default selected value. how do i do it ?

Answer 1

You can do something like this:

ActionsMenu.DataSource = myDataSource;
ActionsMenu.DataTextField = "value";
ActionsMenu.DataValueField = "key";
ActionsMenu.DataBind();

// after the binding
ActionsMenu.Items.Insert(0, new ListItem("Select an action...", String.Empty));
ActionsMenu.Items.Insert(1, new ListItem("-------------------", String.Empty));

d)

Answer 2

在您提出名单后,您可使用插入字。

例:

LISTNAME.Items.Insert(0, new ListItem("Text", "Value") );

0把名单放在名单的第一点。

Answer 3

你可以这样做:

dropdownlist.Items.Insert(0, new ListItem(0, "< Select an option >"))

Answer 4

你的选择是:

Add it to you datatable
Add it after the databinding event in the page lifecycle has completed.
Add it on the client using javascript or jquery.

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