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C# ASP.NET StringBuilder Source Code Example

Description: Illustrates using StringBuilder and StringBuilder Methods in C-Sharp ASP.NET.

Example Webform Code:

<%@ Page Language="C#" AutoEventWireup="true" CodeFile="StringBuilder.aspx.cs" Inherits="LanguageBasics_StringBuilder" %>
 
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
 
<html xmlns="http://www.w3.org/1999/xhtml">
<head id="Head1" runat="server">
    <title></title>
</head>
<body>
    <form id="form1" runat="server">
    <div>
        <asp:Label ID="Label1a" runat="server" Text="Label"></asp:Label><br />
        <asp:Label ID="Label1" runat="server" Text="Label"></asp:Label><br /><br />
        <asp:Label ID="Label2a" runat="server" Text="Label"></asp:Label><br />
        <asp:Label ID="Label2" runat="server" Text="Label"></asp:Label><br /><br />
        <asp:Label ID="Label3a" runat="server" Text="Label"></asp:Label><br />
        <asp:Label ID="Label3" runat="server" Text="Label"></asp:Label><br /><br />
        <asp:Label ID="Label4a" runat="server" Text="Label"></asp:Label><br />
        <asp:Label ID="Label4" runat="server" Text="Label"></asp:Label><br /><br />
        <asp:Label ID="Label5a" runat="server" Text="Label"></asp:Label><br />
        <asp:Label ID="Label5" runat="server" Text="Label"></asp:Label><br /><br />
 
    </div>
    </form>
</body>
</html>

Example Code Behind:

using System.Text;
using System;
 
partial class LanguageBasics_StringBuilder : System.Web.UI.Page
{
 
 
    protected void Page_Load(object sender, System.EventArgs e)
    {
 
 
        //****************************************************************************************
        // Example #1: StringBuilder Append(string) - most common way stringbuilder is used
        // Adds the specified string or string representation of the specified value to the end 
        // of the string
        //****************************************************************************************
 
 
        StringBuilder sb = new StringBuilder();
 
        Label1a.Text = "Example #1: Simple StringBuilder Append(string) ";
        sb.Append("First Line");
        sb.Append("<br />");
        sb.Append("Second Line");
 
        Label1.Text = sb.ToString();
 
 
        //Append(string, startIndex, count)
        //****************************************************************************************
        // Example #2: StringBuilder Append(string, startIndex, count) 
        // Adds a substring of the specified string, starting with the specified
        // position and having the specified length, to the end of the string
        //****************************************************************************************
 
 
        StringBuilder sb2 = new StringBuilder();
        Label2a.Text = "Example #2: StringBuilder Append(string, startIndex, count)";
        sb2.Append("The dog and cat ");
        sb2.Append("love to fight and play", 0, 13);
        //take love to fight and add to end of prev string
        Label2.Text = sb2.ToString();
 
 
 
        //Insert(index, string[, count])
        //****************************************************************************************
        // Example #3: StringBuilder Insert(index, string[, count]) 
        // Inserts the specified string or a string representation of the specified
        // value at the specified position in the string the specified number of 
        // times. If the count is ommitted, a single copy of the string is inserted.
        //****************************************************************************************
 
 
        StringBuilder sb3 = new StringBuilder();
        Label3a.Text = "Example #3: Insert(index, string[, count])";
 
        sb3.Append("This is the initial sentence");
        sb3.Insert(20, "and modified ", 2);
        Label3.Text = sb3.ToString();
 
 
 
        //Remove(startIndex,count)
        //****************************************************************************************
        // Example #4: StringBuilder Remove(startIndex,count) 
        // Removes the specified number of characters from the string starting at
        // the specified position
        //****************************************************************************************
 
 
        StringBuilder sb4 = new StringBuilder();
        Label4a.Text = "Example #4: StringBuilder Remove(startIndex,count)";
 
        sb4.Append("This is the initial sentence");
        sb4.Remove(20, 8);
        Label4.Text = sb4.ToString();
 
 
 
        //Replace(oldString,newString [,startIndex][,count])
        //****************************************************************************************
        // Example #5: StringBuilder Replace(oldString,newString [,startIndex][,count])
        // Replaces all occurences of the old string with the new string starting
        // at the specified position and continuing for the specified number of characters.
        // If you omit startIndex, it starts at beginning
        // If you omit count, it does entire string
        //****************************************************************************************
 
        StringBuilder sb5 = new StringBuilder();
        Label5a.Text = "Example #5: StringBuilder Replace(oldString,newString [,startIndex][,count])";
 
 
        sb5.Append("This is the initial sentence");
        sb5.Replace("initial", "new");
        Label5.Text = sb5.ToString();
 
 
 
    }
}

Example Connection String:

<connectionStrings>
    <add name="Northwind_ConnectionString"
      connectionString="Server=(local)\SQLEXPRESS;Initial Catalog=Northwind;Integrated Security=SSPI" />
    <add name="Pubs_ConnectionString"
      connectionString="Server=(local)\SQLEXPRESS;Initial Catalog=pubs;Integrated Security=SSPI" />
  </connectionStrings>