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<form id="form1" runat="server">
<div>
<asp:Label ID="Label1" runat="server" Text="Label"></asp:Label>
<asp:TextBox ID="TextBox1" runat="server"></asp:TextBox>
</div>
<asp:Button ID="Button1" runat="server" onclick="Button1_Click" Text="Button" />
protected void Page_Load(object sender, EventArgs e)
{
if (!IsPostBack)
{
Label1.Text = "10";
TextBox1.Text = "0";
}
}
protected void Button1_Click(object sender, EventArgs e)
{
Response.Write(Label1.Text);
Label1.Text = "20";
Response.Write(Label1.Text);
}