C# ASP.NET StringBuilder Source Code Example

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StringBuilder Source Code Example

Purpose: – Illustrates using and in C-Sharp ASP.NET.



Prerequistes:

  1. Install Visual Web Developer 2008
  2. Install SQL Server Express
  3. Download Northwind and Pubs Databases
  4. Attach Northwind Database to Databases in Sql Express
  5. Attach pubs Database to Databases in Sql Express

Notes:

  • You can build your own library of syntax examples by using same web site over and over and just add new web forms to it.

Instructions:

  1. Use Visual Web Developer 2008
  2. Create new web site;
    • Click File/New Web Site
    • Select ASP.NET Website Template
    • Select C-Sharp for Language
    • name of Web Site could be CSharp_ASPNET_Syntax.
  3. Add New folder named "LanguageBasics"
    • Right-click project name in solution explorer;
    • add new folder;
    • name of folder could be: LanguageBasics
  4. Add Web Form Named StringBuilder to LanguageBasics folder
    • Right-click LanguageBasics folder;
    • add new item;
    • Select Web Form
    • Check place code behind in separate file
    • Web Form name could be StringBuilder
  5. Click on copy code in code below to copy code into web form StringBuilder.aspx
  6. Click on copy code in second set of code below to copy code into code-behind StringBuilder.aspx.cs
  7. Right-click on StringBuilder.aspx in solution explorer and select view in browser

Step 1: Click on Copy Code to Cut-n-paste code into StringBuilder.aspx

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<%@ Page Language="C#" AutoEventWireup="true" CodeFile="StringBuilder.aspx.cs" Inherits="LanguageBasics_StringBuilder" %>
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<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
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<html xmlns="http://www.w3.org/1999/xhtml">
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<head id="Head1" runat="server">
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    <title></title>
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</head>
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<body>
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    <form id="form1" runat="server">
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    <div>
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        <asp:Label ID="Label1a" runat="server" Text="Label"></asp:Label><br />
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        <asp:Label ID="Label1" runat="server" Text="Label"></asp:Label><br /><br />
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        <asp:Label ID="Label2a" runat="server" Text="Label"></asp:Label><br />
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        <asp:Label ID="Label2" runat="server" Text="Label"></asp:Label><br /><br />
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        <asp:Label ID="Label3a" runat="server" Text="Label"></asp:Label><br />
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        <asp:Label ID="Label3" runat="server" Text="Label"></asp:Label><br /><br />
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        <asp:Label ID="Label4a" runat="server" Text="Label"></asp:Label><br />
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        <asp:Label ID="Label4" runat="server" Text="Label"></asp:Label><br /><br />
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        <asp:Label ID="Label5a" runat="server" Text="Label"></asp:Label><br />
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        <asp:Label ID="Label5" runat="server" Text="Label"></asp:Label><br /><br />
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    </div>
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    </form>
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</body>
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</html>
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Step 2: Click on Copy Code to Cut-n-paste code into SqlCommandUpdate.aspx.cs


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


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