Help in String builder AppendFormat

Hello, I have created a string array to store data taken form multiline textbox. The problem is, the output is not correct. Instead of each text in one line, it still displays the whole sentences.
Hello testing hello
instead of:
Hello
testing
hello
Please help me.
This is my code:
<div> <asp:Textbox ID="test" TextMode="MultiLine" Height="200px" Width="200px" CssClass="text" runat="server"/> <asp:Button ID="button" runat="server" OnClick="Button1_Click" Text="Submit" /> <asp:Textbox ID="test1" TextMode="MultiLine" Height="200px" Width="200px" CssClass="text" runat="server"/> </div> protected void Button1_Click(object sender, EventArgs e) { St ...