c# - How to trim a string to a specified length

String trim to length
string-trim-to-length.aspx

<%@ Page Language="C#" AutoEventWireup="true"%>  
  
<!DOCTYPE html>    
<script runat="server">  
    protected void Button1_Click(object sender, System.EventArgs e)  
    {  
        //this section create a string variable.  
        string birds = "Southern Giant Petrel. Sooty Shearwater. Macaroni Penguin";  
  
        Label1.Text = "string of birds..................<br />";  
        Label1.Text += birds;

        string trimmed20Char = birds;
        string trimmedWithoutDot = birds;

        if (birds.Length > 10)
        {
            //this line truncated/trimmed string to 20 character.
            trimmed20Char = birds.Substring(0, 17);
            trimmed20Char += "...";

            //this line truncated string without using dotted.
            trimmedWithoutDot = birds.Substring(0, 20);
        }

        Label1.Text += "<br /><br />trimmed string 20 charcter length limit.........<br />";
        Label1.Text += trimmed20Char;

        Label1.Text += "<br /><br />trimmed string 20 charcter length limit without dotted.........<br />";
        Label1.Text += trimmedWithoutDot;
    }    
</script>    
    
<html xmlns="http://www.w3.org/1999/xhtml">    
<head id="Head1" runat="server">    
    <title>c# example - string trim to length</title>    
</head>    
<body>    
    <form id="form1" runat="server">    
    <div>    
        <h2 style="color:MidnightBlue; font-style:italic;">    
            c# example - string trim to length
        </h2>    
        <hr width="550" align="left" color="Gainsboro" />    
        <asp:Label     
            ID="Label1"     
            runat="server"    
            Font-Size="Large"  
            >    
        </asp:Label>    
        <br /><br />  
        <asp:Button     
            ID="Button1"     
            runat="server"     
            Text="string trim to length"    
            OnClick="Button1_Click"  
            Height="40"    
            Font-Bold="true"    
            />    
    </div>    
    </form>    
</body>    
</html>
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