<%@ Page Language="C#" AutoEventWireup="True" %>
<Script language="C#" runat="server">
void Page_Load(Object Sender,EventArgs e){
Page.DataBind();
}
string ReturnSource(){
return (TextBox_1.Text);
}
</Script>
<form id="Form_1" runat="server">
<asp:textbox TextMode="MultiLine" Columns="50" Rows="10" ID="TextBox_1" runat="server"/>
<input id="Button_1" type="Submit" value="Button" runat="server"/>
</form>
<asp:label ID="Label_1" Text="<%#ReturnSource()%>" runat="server"></asp:label>
