C# String Examples – String Examples C#

Posted by on Monday, December 21, 2009 · Leave a Comment 

C# String Examples – String Examples C#

Purpose: – Illustrates using and in C-Sharp.

Prerequistes:

  1. Install C# (Express or Standard Edition)
  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:

  • Console Application is used to simplify things, but Windows Forms or Web Forms could also be used
  • You can build your own library of syntax examples by using same project over and over and just adding new classes to it.

Instructions:

  1. Use C# 2008 (express or standard)
  2. Create new project;
    • Click File/New Project
    • Select Console Application Template
    • Select C-Sharp for Language
    • name of project could be CSharp_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 Class named clsString to LanguageBasics folder
    • Right-click LanguageBasics folder;
    • add new item;
    • Select Class
    • Class name could be clsString
  5. Click on copy code in code below to copy code into class clsString.cs
  6. Click on copy code in second set of code below to copy code into Program.cs
  7. Click on green arrow in toolbar in VS or press F5 to run program.

Step 1: Click on Copy Code to Cut-n-paste code into clsString.cs

using System;
using System.Text;
 
 
 
 
public class clsString
{
 
    public void Main()
    {
 
        //****************************************************************************************
        // Example #1: StartsWith(string)
        // Example #2: EndsWith(string)
        // Example #3: IndexOf(string[, startIndex][,count])
        // Example #4: LastIndexOf(string[, startIndex][,count])
        // Example #5: Insert(startIndex, string)
        // Example #6: PadLeft(totalWidth [, paddingCharacter])
        // Example #7: PadRight(totalWidth [, paddingCharacter])
        // Example #8: Remove(startIndex, count)
        // Example #9: Replace(oldString, newString)
        // Example #10: Substring(startIndex[, length])
        // Example #11: ToLower
        // Example #12: ToUpper
        // Example #13: Trim
        // Example #14: Length
        //****************************************************************************************
 
 
        //****************************************************************************************
        // Example #1: StartsWith(string)
        // Returns a Boolean value that indicates if the string starts with the specified string. 
        //****************************************************************************************
 
        Console.WriteLine("Example #1: StartsWith(string) ");
 
        string strStartsWithExample = "This is a test string";
 
        Console.WriteLine(strStartsWithExample.StartsWith("This"));
        //Returns True
 
        //write blank line to make output easier to read
        Console.WriteLine();
 
        //****************************************************************************************
        // Example #2: EndsWith(string)
        // Returns a Boolean value that indicates if the string ends with the specified string. 
        //****************************************************************************************
 
        Console.WriteLine("Example #2: EndsWith(string) ");
 
        string strEndsWithExample = "This is a test string";
 
        Console.WriteLine(strEndsWithExample.EndsWith("string"));
        //Returns True
 
        //write blank line to make output easier to read
        Console.WriteLine();
 
        //****************************************************************************************
        // Example #3: IndexOf(string[, startIndex][,count])
        // Returns an integer that represents the position of the first occurrence of the
        // specified number of characters. If you specify startIndex, that specifies
        // where to start looking. If you specify count, that specifies how many characters to 
        // to search past start. If the string is not found, this method returns -1
        //****************************************************************************************
 
        Console.WriteLine("Example #3: IndexOf(string[, startIndex][,count]) ");
 
        string strIndexOfExample = "This is a test string";
 
        Console.WriteLine(strIndexOfExample.IndexOf("is"));
        //Returns 2
 
        Console.WriteLine(strIndexOfExample.IndexOf("xyz"));
        //Returns -1
 
        //write blank line to make output easier to read
        Console.WriteLine();
 
        //****************************************************************************************
        // Example #4: LastIndexOf(string[, startIndex][,count])
        // Returns an integer that represents the position of the last occurrence of the
        // specified number of characters. If you specify startIndex, that specifies
        // where to start looking. If you specify count, that specifies how many characters to 
        // to search past start. If the string is not found, this method returns -1
        //****************************************************************************************
 
        Console.WriteLine("Example #4: LastIndexOf(string[, startIndex][,count]) ");
 
        string strLastIndexOfExample = "This is a test string";
 
        Console.WriteLine(strLastIndexOfExample.LastIndexOf("is"));
        //Returns 5
 
        Console.WriteLine(strLastIndexOfExample.LastIndexOf("xyz"));
        //Returns -1
 
        //write blank line to make output easier to read
        Console.WriteLine();
 
        //****************************************************************************************
        // Example #5: Insert(startIndex, string)
        // Returns a string with the specified string inserted beginning at the specified position.
        //****************************************************************************************
 
        Console.WriteLine("Example #5: Insert(startIndex, string) ");
 
        string strInsertExample = "This is a test string";
        int intIndex = 0;
 
        // First find position of word test
        intIndex = strInsertExample.IndexOf("test");
 
        // Insert "simple" before "test"
        Console.WriteLine(strInsertExample.Insert(intIndex, "simple "));
 
        //write blank line to make output easier to read
        Console.WriteLine();
 
        //****************************************************************************************
        // Example #6: PadLeft(totalWidth [, paddingCharacter])
        // Returns a string that is right-aligned and padded on left with character specified.
        // If no padddingCharacter is specified, space is used. totalWidth is total width of column
        // This allows you to create a nice straight column even though lengths of text vary.
        //****************************************************************************************
 
        Console.WriteLine("Example #6: PadLeft(totalWidth [, paddingCharacter]) ");
 
        string strPadLeftExampleA = "This is a test string";
        string strPadLeftExampleB = "short";
        string strPadLeftExampleC = "longer";
 
 
 
        // PadLeft "simple" before "test"
        Console.WriteLine(strPadLeftExampleA.PadLeft(35));
        Console.WriteLine(strPadLeftExampleB.PadLeft(35));
        Console.WriteLine(strPadLeftExampleC.PadLeft(35));
 
        //write blank line to make output easier to read
        Console.WriteLine();
 
        //****************************************************************************************
        // Example #7: PadRight(totalWidth [, paddingCharacter])
        // Returns a string that is left-aligned and padded on right with character specified.
        // If no padddingCharacter is specified, space is used. totalWidth is total width of column
        // This allows you to create a nice straight column even though lengths of text vary.
        //****************************************************************************************
 
        Console.WriteLine("Example #7: PadRight(totalWidth [, paddingCharacter]) ");
 
        string strPadRightExampleA = "This is a test string";
        string strPadRightExampleB = "short";
        string strPadRightExampleC = "longer";
 
 
 
        // PadRight "simple" before "test"
        Console.WriteLine(strPadRightExampleA.PadRight(35) + "next column starts here");
        Console.WriteLine(strPadRightExampleB.PadRight(35) + "next column starts here");
        Console.WriteLine(strPadRightExampleC.PadRight(35) + "next column starts here");
 
        //write blank line to make output easier to read
        Console.WriteLine();
 
        //****************************************************************************************
        // Example #8: Remove(startIndex, count)
        // Returns a string with the specified number of characters removed starting at startIndex.
        // If no Count is specified, the remainder of string is removed
        //****************************************************************************************
 
        Console.WriteLine("Example #8: Remove(startIndex, count) ");
 
        string strRemoveExample = "This is a test string";
        int intIndexRemove = 0;
 
        // First find position of word test
        intIndexRemove = strRemoveExample.IndexOf("test");
 
        // Remove rest of string starting with word "test"
        Console.WriteLine(strRemoveExample.Remove(intIndex));
 
        //write blank line to make output easier to read
        Console.WriteLine();
 
        //****************************************************************************************
        // Example #9: Replace(oldString, newString)
        // Returns a string with all occurences of oldString replaced by newString
        //****************************************************************************************
 
        Console.WriteLine("Example #9: Replace(oldString, newString) ");
 
        string strReplaceExample = "This is a test string";
 
        // Replace "This" with "That"
        Console.WriteLine(strReplaceExample.Replace("This", "That"));
 
        //write blank line to make output easier to read
        Console.WriteLine();
 
        //****************************************************************************************
        // Example #10: Substring(startIndex[, length])
        // Returns the string that starts at the specified position and has the specified
        // length. If the length is not specified, all of the characters to the end are returned.
        //****************************************************************************************
 
        Console.WriteLine("Example #10: Substring(startIndex[, length]) ");
 
        string strSubstringExample = "This is a test string";
        int intIndexSubstring = 0;
 
        // First find position of word test
        intIndexSubstring = strRemoveExample.IndexOf("test");
 
        // Get everything starting at "test" to end of string
        Console.WriteLine(strSubstringExample.Substring(intIndexSubstring));
 
        //write blank line to make output easier to read
        Console.WriteLine();
 
        //****************************************************************************************
        // Example #11: ToLower
        // Returns the string in Lowercase
        //****************************************************************************************
 
        Console.WriteLine("Example #11: ToLower");
 
        string strToLowerExample = "This is a test string";
 
        // Return Lowercase
        Console.WriteLine(strToLowerExample.ToLower());
 
        //write blank line to make output easier to read
        Console.WriteLine();
 
        //****************************************************************************************
        // Example #12: ToUpper
        // Returns the string in Uppercase
        //****************************************************************************************
 
        Console.WriteLine("Example #12: ToUpper ");
 
        string strToUpperExample = "This is a test string";
 
        // Return Uppercase
        Console.WriteLine(strToUpperExample.ToUpper());
 
        //write blank line to make output easier to read
        Console.WriteLine();
 
        //****************************************************************************************
        // Example #13: Trim
        // Returns the string with leading and trailing spaces removed
        //****************************************************************************************
 
        Console.WriteLine("Example #13: Trim ");
 
        string strTrimExample = "     ABC     ";
 
        // Return Uppercase
        Console.WriteLine(strTrimExample.Trim().Length);
 
        //write blank line to make output easier to read
        Console.WriteLine();
 
        //****************************************************************************************
        // Example #14: Length
        // Returns the string with leading and trailing spaces removed
        //****************************************************************************************
 
        Console.WriteLine("Example #14: Length ");
 
        string strLengthExample = "     ABC     ";
 
        // Return Uppercase
        Console.WriteLine(strLengthExample.Length);
 
        //write blank line to make output easier to read
        Console.WriteLine();
 
 
 
        //Prevent console from closing before you press enter
        Console.ReadLine();
 
    }
 
 
}

Step 2: Click on Copy Code to Cut-n-paste code into Program.cs

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
 
namespace CSharp_Syntax
{
    class Program
    {
        static void Main(string[] args)
        {
            //LanguageBasics
 
 
            clsString myString = new clsString();
            myString.Main();
 
 
        }
    }
}

Step 3: Click on green arrow in toolbar in VS or press F5 to run program.

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