如何在dropdownlist2上的dropdownlist1中显示所有数据selectindexchange

问题描述

当我选择DropDownList4
代码是

When I select the DropDownList4
code is

protected void DropDownList4_SelectedIndexChanged(object sender, EventArgs e)
        {
            int a = 0;
            DropDownList3.Items.Insert(0, new ListItem("Select Item", "Default value"));
 DropDownList3.DataSource = ds1;
 DropDownList3.DataValueField = "ItemName";
 DropDownList3.DataBind();
}

DropDownList4的属性为-

Properties of DropDownList4 are -

AppendDataBoundItems=True
AutoPostBack=true
CausesValidation=False

DropDownList3的属性为-

Properties of DropDownList3 are -

AppendDataBoundItems=False
AutoPostBack=true
CausesValidation=False}

选择项目的文本不显示.

Select item text is not showing.

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