c# - How to get only first n characters from a string

First n characters from a string
get-only-first-n-characters-from-a-string.aspx 

<%@ Page Language="C#" AutoEventWireup="true"%>

<!DOCTYPE html>
<script runat="server">
    protected void Button1_Click(object sender, System.EventArgs e)
    {
        string s = "this is a sample string.";
        int length = 15;
        string ncharacters = s.Substring(0,Math.Min(length,s.Length));
        Label1.Text = s + "<br />";
        Label1.Text += ncharacters;
    }
</script>

<html xmlns="http://www.w3.org/1999/xhtml">
<head id="Head1" runat="server">
    <title>c# example - get only first n characters from a string</title>
</head>
<body>
    <form id="form1" runat="server">
    <div>
        <h2 style="color:DarkBlue; font-style:italic;">
            c# example - get only first n characters from a string
        </h2>
        <hr width="550" align="left" color="LightBlue" />  

        <asp:Label 
            ID="Label1" 
            runat="server"
            Font-Size="X-Large"
            >
        </asp:Label>
        <br /><br />
        <asp:Button 
            ID="Button1" 
            runat="server" 
            Text="get only first n characters[15]" 
            OnClick="Button1_Click"
            Height="40"
            Font-Bold="true"
            />
    </div>
    </form>
</body>
</html>
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