Multiline Textbox in ASP.NET c#

Multiline Textbox in ASP.NET c#/
enter key in textbox c#

<h1>MULTILINE TEXTBOX  Demo in ASP.NET</h1>
        <asp:TextBox ID="TextBox1" runat="server"   TextMode="MultiLine" Height="71px" Width="400px" ValidateRequestMode="Enabled"></asp:TextBox>
        <asp:Button ID="Button1" runat="server" Text="Button" />

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