c# - How to apply padding on a StringBuilder

c# example - stringbuilder padding padleft padright
The following asp.net c# example code demonstrate us how can we apply padding on StringBuilder value programmatically at run time in an asp.net application. In .net framework's StringBuilder Class represent a mutable string of characters.

StringBuilder Class has no built in method or property to apply padding on it's text. But String Class has two built in methods to padding its content. We can use StringBuilder.ToString() method to directly convert a StringBuilder value to a System.String object.

String Class has two methods two padding it's content, those are PadLeft() and PadRight(). Both methods has overload.

String Class PaLeft(Int32, Char) overloaded method return a new string that right-aligns the characters in this instance by padding them on the left with a specified Unicode character, for a specified total length. So, we can specify number of times the specified character will be written to pad left on string.

String Class PadRight(Int32, Char) overloaded method return a new string that left-aligns the characters in this string by padding them on the right with a specified Unicode character, for a specified total length.
stringbuilder-padding-padleft-padright.aspx

<%@ Page Language="C#" AutoEventWireup="true"%>
  
<!DOCTYPE html>
  
<script runat="server"> 
    protected void Button1_Click(object sender, System.EventArgs e)  
    {
        StringBuilder stringb = new StringBuilder();
        stringb.Append("Indian Black Eagle. Golden Eagle.");

        Label1.Text = stringb.ToString();

        //this line padding stringbuilder content padleft 5.
        string changedString = stringb.ToString().PadLeft(stringb.Length+5,'#');
        
        stringb.Replace(stringb.ToString(),changedString);

        Label1.Text += "<br /><br />pad left stringbuilder................ <br />";
        Label1.Text += stringb.ToString();

        //this line padding stringbuilder content padright 3.
        string changedString2 = stringb.ToString().PadRight(stringb.Length + 3, '*');

        stringb.Replace(stringb.ToString(), changedString2);

        Label1.Text += "<br /><br />pad right stringbuilder................ <br />";
        Label1.Text += stringb.ToString();
    }  
</script>  
  
<html xmlns="http://www.w3.org/1999/xhtml">  
<head id="Head1" runat="server">  
    <title>c# example - stringbuilder padding padleft padright</title>  
</head>  
<body>  
    <form id="form1" runat="server">  
    <div>  
        <h2 style="color:MidnightBlue; font-style:italic;">  
            c# example - stringbuilder padding padleft padright
        </h2>  
        <hr width="550" align="left" color="Gainsboro" />  
        <br />  
        <asp:Label   
            ID="Label1"   
            runat="server"  
            Font-Size="Large"  
            >  
        </asp:Label>  
        <br /><br /><br />
        <asp:Button   
            ID="Button1"   
            runat="server"   
            Text="stringbuilder padding padleft padright"  
            OnClick="Button1_Click"
            Height="40"  
            Font-Bold="true"  
            />  
    </div>  
    </form>  
</body>  
</html>
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