理应的形式是：点击后出现textbox然后对话框d出空。你的输入是没法赋值的。
如果要显示，将 String S
TextBox txt = new TextBox()
txt.SetBounds(250, 0, 200, 400)
this.Controls.Add(txt)
txt.Enabled = true
放在构造函数或者form_load事件中。
这样写：
TextBox txt = new TextBox()
String S
private void button1_Click(object sender, EventArgs e)
{
S = txt.Text
MessageBox.Show(S)
}
private void Form1_Load(object sender, EventArgs e)
{
txt.SetBounds(250, 0, 200, 400)
this.Controls.Add(txt)
txt.Enabled = true
}
protected void Page_Load(object sender, EventArgs e){
}
protected void ImageButton1_Click(object sender, ImageClickEventArgs e)
{
string Txt = TextBox1.Text
DropDownList1.Items.Add(new ListItem(Txt, Txt))
ListBox1.Items.Add(new ListItem(Txt, Txt))
}
protected void ImageButton2_Click(object sender, ImageClickEventArgs e)
{
int index = DropDownList1.SelectedIndex
DropDownList1.Items.RemoveAt(index)
}
protected void ImageButton3_Click(object sender, ImageClickEventArgs e)
{
int index = ListBox1.SelectedIndex
ListBox1.Items.RemoveAt(index)
}
protected void DropDownList1_SelectedIndexChanged(object sender, EventArgs e)
{
if (sender.GetType().Name == "DropDownList")
{
TextBox1.Text = DropDownList1.SelectedItem.Text
}
else {
TextBox1.Text = ListBox1.SelectedItem.Text
}
}
<html xmlns=" http://www.w3.org/1999/xhtml">
<head runat="server">
<title>无标题页</title>
<script type="text/javascript">
function vali() {
var index = document.getElementById("ListBox1").selectedIndex
if (index <0) {
alert("请选择！")
return false
}
return true
}
</script>
</head>
<body>
<form id="form1" runat="server">
<div>
<asp:TextBox ID="TextBox1" runat="server"></asp:TextBox><br />
<asp:ImageButton ID="ImageButton1" runat="server" ImageUrl="~/img/01.jpg"
onclick="ImageButton1_Click" />
<br />
<asp:ImageButton ID="ImageButton2" runat="server" ImageUrl="~/img/01.jpg"
onclick="ImageButton2_Click" />
<br />
<asp:ImageButton ID="ImageButton3" runat="server" ImageUrl="~/img/01.jpg"
onclick="ImageButton3_Click" OnClientClick="javascript:return vali()"/>
<br />
<asp:DropDownList ID="DropDownList1" runat="server" AutoPostBack="True"
onselectedindexchanged="DropDownList1_SelectedIndexChanged">
</asp:DropDownList><br />
<asp:ListBox ID="ListBox1" runat="server"
onselectedindexchanged="DropDownList1_SelectedIndexChanged" AutoPostBack="True"></asp:ListBox><br />
</div>
</form>
</body>
</html>
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