Drop down menu 下拉列表问题

我尝试将新项目添加到drodownlist。我希望添加的项目位于drodownlist的第一个位置。我如何才能做到这一点

   I want this to be a first option
   ListItem itemspecial = new ListItem();
   itemspecial.Value = "-1";
   itemspecial.Text = "Please select specialization";
   ddlSpecialization.Items.Add(itemspecial);

    ddlSpecialization.DataTextField = "Description";
    ddlSpecialization.DataValueField = "Id";
    ddlSpecialization.DataSource = objspecial.GetAll();
    ddlSpecialization.DataBind();

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您可以使用

DropDownList

的

Insert

功能执行此操作：

ListItem itemspecial = new ListItem();
itemspecial.Value = "-1";
itemspecial.Text = "Please select specialization";
ddlSpecialization.Items.Insert(0, itemspecial);

ddlSpecialization.DataTextField = "Description";
ddlSpecialization.DataValueField = "Id";
ddlSpecialization.DataSource = objspecial.GetAll();
ddlSpecialization.DataBind();

使用

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--ddleSpecialization.Items.insertAt（itemspecial，0） 在插入之前先进行数据绑定

ddlSpecialization.DataTextField = "Description";
ddlSpecialization.DataValueField = "Id";
ddlSpecialization.DataSource = objspecial.GetAll();
ddlSpecialization.DataBind();

ddlSpecialization.Items.Insert(0, new ListItem("Please select specialization", "-1"));

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您可能希望根据您使用的技术/语言来标记此问题。