Asp.net - Add blank item at top of dropdownlist

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甜味超标
甜味超标 2020-11-30 20:03

Why is the dropdown not showing my blank item first? Here is what I have

drpList.Items.Add(New ListItem(\"\", \"\"))

With drpList
    .DataSource = myContro         


        
10条回答
  •  时光取名叫无心
    2020-11-30 20:27

    Like "Whisk" Said, the trick is in "AppendDataBoundItems" property

    protected void Page_Load(object sender, EventArgs e)
    {
        if (!IsPostBack)
        {
            DropDownList1.AppendDataBoundItems = true;
            DropDownList1.Items.Insert(0, new ListItem(String.Empty, String.Empty));
            DropDownList1.SelectedIndex = 0;
        }
    }
    

    Thanks "Whisk"

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