Reverse a String
The String represents text as a sequence of UTF-16 code units. The String is a sequential collection of characters that is used to represent text. The String is a sequential collection of System.Char objects.
The following .net c# tutorial code demonstrates how we can reverse a String object. So, in this .net c# tutorial code we will reverse String characters such as if a String instance contains the text ‘Yellow’ then we will reverse it as ‘wolleY’. It means we will rearrange the character’s position of a String instance from last to first and so on.
To reverse a String object, at first we will convert the String instance into a Char array. Then we reverse the elements of the Char array using the .net Array built-in method. Finally, we will create a new instance of the String object from the reversed Char Array object.
The String ToCharArray() method copies the characters in this instance to a Unicode character Array. The String ToCharArray() method returns a Unicode character Array whose elements are the individual characters of this instance. If this instance is an empty string then the returned Array is empty and has a zero length. So using this String ToCharArray() method we convert the String instance to a Char Array object.
The Array Reverse() method reverses the order of the elements in a one-dimensional Array or in a portion of the Array. The Array Reverse(Array) method overload reverses the sequence of the elements in the entire one-dimensional Array. So, using this Array Reverse() method we can reverse the order of elements in an Array.
The String String(Char[]) constructor initializes a new instance of the String class to the Unicode characters indicated in the specified character Array. So we can create an instance of a String object from the reversed Char Array. Finally, in this way, we reversed a String instance.
The following .net c# tutorial code demonstrates how we can reverse a String object. So, in this .net c# tutorial code we will reverse String characters such as if a String instance contains the text ‘Yellow’ then we will reverse it as ‘wolleY’. It means we will rearrange the character’s position of a String instance from last to first and so on.
To reverse a String object, at first we will convert the String instance into a Char array. Then we reverse the elements of the Char array using the .net Array built-in method. Finally, we will create a new instance of the String object from the reversed Char Array object.
The String ToCharArray() method copies the characters in this instance to a Unicode character Array. The String ToCharArray() method returns a Unicode character Array whose elements are the individual characters of this instance. If this instance is an empty string then the returned Array is empty and has a zero length. So using this String ToCharArray() method we convert the String instance to a Char Array object.
The Array Reverse() method reverses the order of the elements in a one-dimensional Array or in a portion of the Array. The Array Reverse(Array) method overload reverses the sequence of the elements in the entire one-dimensional Array. So, using this Array Reverse() method we can reverse the order of elements in an Array.
The String String(Char[]) constructor initializes a new instance of the String class to the Unicode characters indicated in the specified character Array. So we can create an instance of a String object from the reversed Char Array. Finally, in this way, we reversed a String instance.
string-reverse.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 characters = "ABCDEF";
Label1.Text = "string of characters..................<br />";
Label1.Text += characters + "<br /><br />";
//this line create a char array from string.
char[] chars = characters.ToCharArray();
//this line reverse elements of char array.
Array.Reverse(chars);
//this line convert char array to string.
string reversedString = new string(chars);
Label1.Text += "<br />reversed string........<br />";
Label1.Text += reversedString;
}
</script>
<html xmlns="http://www.w3.org/1999/xhtml">
<head id="Head1" runat="server">
<title>c# example - string reverse</title>
</head>
<body>
<form id="form1" runat="server">
<div>
<h2 style="color:MidnightBlue; font-style:italic;">
c# example - string reverse
</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 reverse"
OnClick="Button1_Click"
Height="40"
Font-Bold="true"
/>
</div>
</form>
</body>
</html>

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