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<input id="Text1" onchange="javascript:change(this.value);" type="text" />
<asp:Label ID="Label1" runat="server" Text="Label"></asp:Label>
function change(values)
{
document.getElementById("Label1").innerText=values.substr(0,2);
}
<asp:TextBox ID="TextBox2" runat="server" OnTextChanged="TextBox2_TextChanged" AutoPostBack="True"></asp:TextBox>
protected void TextBox2_TextChanged(object sender, EventArgs e)
{
this.Label1.Text = this.TextBox2.Text.Substring(0, 2);
}
this.lable1.text= textbox.text;