c# - How to get number of characters from right side of a string

Get number of characters from String right side

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 get a number of characters from the right side of a String instance. So, in this .net c# tutorial code we will take only a specified number of characters from a String object’s right side.

To achieve this, here we create a custom function whose name is ‘right’. This custom function gets a substring from the source String. We get the substring from the source String at the very end position with a specified length.

The String SubString(int startIndex) method overload retrieves a substring from this instance where the substring starts at a specified character position and continues to the end of the String.

So using SubString(int startIndex) method we can get a specified number of characters from the right side of a String instance. We have to pass the source String length minus the specified number of characters length as the startIndex parameter value to the Substring(int startIndex) method.

string-right-function.aspx


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

<!DOCTYPE html>  
<script runat="server">
    //custom function for extract right most characters from string
    public static string right(string originalString, int length)
    {
        string rightString = originalString.Substring(originalString.Length - length);
        return rightString;
    }
     
    protected void Button1_Click(object sender, System.EventArgs e)  
    {
        //this section create a string variable.
        string plants = "Red Birch. Spice Birch. Water Birch. Yellow Birch.";

        Label1.Text = "string of plants..................<br />";
        Label1.Text += plants + "<br />";

        //this line get right most 6 letters from string
        string rightSubString = right(plants,6);

        Label1.Text += "<br />right most 6 characters from plants string........<br />";
        Label1.Text += rightSubString;

        Label1.Text += "<br /><br />right most 13 characters from plants string........<br />";
        Label1.Text += right(plants,13);
    }  
</script>  
  
<html xmlns="http://www.w3.org/1999/xhtml">  
<head id="Head1" runat="server">  
    <title>c# example - string right function</title>  
</head>  
<body>  
    <form id="form1" runat="server">  
    <div>  
        <h2 style="color:MidnightBlue; font-style:italic;">  
            c# example - string right function
        </h2>  
        <hr width="550" align="left" color="Gainsboro" />  
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            ID="Label1"   
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        <asp:Button   
            ID="Button1"   
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            Text="string right function"  
            OnClick="Button1_Click"
            Height="40"  
            Font-Bold="true"  
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    </div>  
    </form>  
</body>  
</html>

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