c# - How to escape brackets (curly braces) in a formatted string

Escape brackets in a formatted string
escape-curly-braces-in-a-format-string.aspx

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<!DOCTYPE html>
<script runat="server">
    protected void Button1_Click(object sender, System.EventArgs e)
    {
        string num = "10,25,30,50";
        string output = String.Format("text{{{0}}}", num);
        Label1.Text += output;
    }
</script>

<html xmlns="http://www.w3.org/1999/xhtml">
<head runat="server">
    <title>c# example - escape brackets (curly braces) in a format string</title>
</head>
<body>
    <form id="form1" runat="server">
    <div>
        <h2 style="color:DarkBlue; font-style:italic;">
            c# example - escape brackets (curly braces)
            <br /> in a format string
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        <hr width="550" align="left" color="LightBlue" />  

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        <br /><br />
        <asp:Button 
            ID="Button1" 
            runat="server" 
            Text="Escape Curly Braces" 
            OnClick="Button1_Click"
            Height="40"
            Font-Bold="true"
            />
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    </form>
</body>
</html>
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