c# - How to reverse an array elements

Array Reverse() Method

.Net framework Array.Reverse() method allow us to reverse the sequence of the elements in the entire one-dimensional Array. this array Reverse() method exists under System namespace. this method require to pass a parameter named 'array'.

the 'array' parameter value type is System.Array which represents the one-dimensional Array to reverse. array Reverse() method throw ArgumentNullException, if the 'array' is null. this method also throw RankException exception, if the 'array' is multidimensional.

the following asp.net c# example code demonstrate us how can we reverse an array elements sequence programmatically at run time in an asp.net application.

ArrayReverse.aspx


<%@ Page Language="C#" %>

<!DOCTYPE html>

<script runat="server">
    private string[] favoriteColorArray = { "Green", "GreenYellow", "HoneyDew", "HotPink" };

    protected void Page_Load(object sender, System.EventArgs e) {
        ListBox1.DataSource = favoriteColorArray;
        ListBox1.DataBind();
    }

    protected void Button1_Click(object sender, System.EventArgs e)
    {
        Array.Reverse(favoriteColorArray);
        ListBox1.DataSource = favoriteColorArray;
        ListBox1.DataBind();
        Label1.Text = "Array reversed and repopulate ListBox";
    }
</script>

<html xmlns="http://www.w3.org/1999/xhtml">
<head id="Head1" runat="server">
    <title>How to reverse an array in asp.net</title>
</head> 
<body>
    <form id="form1" runat="server">
    <div>
        <h2 style="color:Green">asp.net array example: Array Reverse</h2>
        <asp:Label 
             ID="Label1" 
             runat="server" 
             Font-Size="Large"
             ForeColor="SeaGreen"
             Font-Bold="true"
             Font-Italic="true"
             >
        </asp:Label>
        <br /><br />
        <asp:Label 
             ID="Label2" 
             runat="server" 
             ForeColor="MediumVioletRed"
             Font-Bold="true"
             Text="The ListBox populated by an array"
             >
        </asp:Label>
        <br />
        <asp:ListBox 
             ID="ListBox1" 
             runat="server" 
             BackColor="MediumVioletRed" 
             ForeColor="AliceBlue"
             >
        </asp:ListBox>
        <br /><br />
        <asp:Button 
             ID="Button1" 
             runat="server" 
             OnClick="Button1_Click"
             Font-Bold="true"
             Text="Reverse Array And RePopulate ListBox"
             ForeColor="MediumVioletRed"
             />   
    </div>
    </form>
</body>
</html>

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