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<ul>
<li>数字1<asp:TextBox ID="TextBox1" runat="server" ontextchanged="TextBox1_TextChanged"></asp:TextBox></li>
</ul>
<p><asp:Label ID="Label1" runat="server"></asp:Label></p>
protected void Page_Load(object sender, EventArgs e)
{
this.TextBox1.Text = "100";
}
protected void TextBox1_TextChanged(object sender, EventArgs e)
{
this.Label1.Text = "1";
}
<form id="form1" runat="server">
<asp:ScriptManager ID="ScriptManager1" runat="server">
</asp:ScriptManager>
<asp:UpdatePanel ID="UpdatePanel1" runat="server">
<ContentTemplate>
<asp:TextBox ID="TextBox1" runat="server" AutoPostBack="True" OnTextChanged="TextBox1_TextChanged"></asp:TextBox>
<asp:Label ID="Label1" runat="server" Text="Label"></asp:Label>
</ContentTemplate>
</asp:UpdatePanel>
</form>
protected void TextBox1_TextChanged(object sender, EventArgs e)
{
Label1.Text = TextBox1.Text;
}