Count vowels and consonants in a string

Step 1: Design Page – CountVowelsConsonants.aspx

<%@ Page Language="C#" AutoEventWireup="true" CodeFile="CountVowelsConsonants.aspx.cs" Inherits="CountVowelsConsonants" %>

<!DOCTYPE html>
<html xmlns="http://www.w3.org/1999/xhtml">
<head runat="server">
    <title>Count Vowels and Consonants - Real Time Example</title>
    <style>
        body {
            font-family: Arial;
            background-color: #f0f2f5;
            margin: 50px;
        }
        .container {
            width: 480px;
            margin: auto;
            background: white;
            border-radius: 10px;
            box-shadow: 0px 0px 10px #ccc;
            padding: 25px;
        }
        h2 {
            color: #1A2A80;
            text-align: center;
        }
        .form-control {
            width: 100%;
            padding: 8px;
            margin-top: 10px;
        }
        .btn {
            background-color: #7A85C1;
            color: white;
            border: none;
            padding: 10px;
            margin-top: 10px;
            border-radius: 5px;
            cursor: pointer;
            width: 100%;
        }
        .result {
            margin-top: 20px;
            font-weight: bold;
            color: #333;
            text-align: center;
        }
        .highlight {
            color: #1A2A80;
        }
    </style>
</head>
<body>
    <form id="form1" runat="server">
        <div class="container">
            <h2>Count Vowels and Consonants</h2>

            <asp:Label ID="lblInput" runat="server" Text="Enter a String:"></asp:Label><br />
            <asp:TextBox ID="txtInput" runat="server" CssClass="form-control" placeholder="Example: Sandhiya Priya"></asp:TextBox><br />

            <asp:Button ID="btnCount" runat="server" Text="Count Letters" CssClass="btn" OnClick="btnCount_Click" /><br />

            <asp:Label ID="lblResult" runat="server" CssClass="result"></asp:Label>
        </div>
    </form>
</body>
</html>

Step 2: Backend Logic – CountVowelsConsonants.aspx.cs

using System;

public partial class CountVowelsConsonants : System.Web.UI.Page
{
    protected void Page_Load(object sender, EventArgs e)
    {
    }

    protected void btnCount_Click(object sender, EventArgs e)
    {
        string input = txtInput.Text.Trim().ToLower();

        if (string.IsNullOrEmpty(input))
        {
            lblResult.Text = "Please enter a valid string.";
            lblResult.ForeColor = System.Drawing.Color.Red;
            return;
        }

        int vowelCount = 0;
        int consonantCount = 0;

        foreach (char c in input)
        {
            if (char.IsLetter(c))
            {
                if ("aeiou".Contains(c))
                    vowelCount++;
                else
                    consonantCount++;
            }
        }

        lblResult.Text = $"Vowels: <span class='highlight'>{vowelCount}</span> | Consonants: <span class='highlight'>{consonantCount}</span>";
        lblResult.ForeColor = System.Drawing.Color.Black;
    }
}

Real-Time Example Flow

Open CountVowelsConsonants.aspx in your browser.
Enter: Sandhiya Priya
Click “Count Letters”
Output displays:

Vowels: 5 | Consonants: 8

Explanation

Step	Description
1	Accept input string from the user.
2	Convert to lowercase for uniform comparison.
3	Loop through each character.
4	Check if it’s a letter using char.IsLetter().
5	If it’s a, e, i, o, u → vowel; else consonant.
6	Display counts dynamically.

Sample Input / Output

Input	Vowels	Consonants
Sandhiya	3	5
Priya	2	3
Welcome	3	4
Education	5	4