Enumerations in c#

This blog explains how enumerations works in c#.

Definition:

Enum is a keyword that represent a value type for declaring a set of named constant.

An enum helps to define a series of related integral constants that represent special values within a module of code. An enum can be used in a switch statement, which is used as a decision-making statement for comparing numeric values.

Example:

1. Create a Default.aspx

<%@ Page Language="C#" AutoEventWireup="true" CodeBehind="Default.aspx.cs" Inherits="EnumExample.Default" %>
 
<!DOCTYPE html>
 
<html xmlns="http://www.w3.org/1999/xhtml">
<head runat="server">
    <title></title>
</head>
<body>
    <formid="form1"runat="server">
 
        <table>
            <tr>
                <tdcolspan="2">Enter First Number</td>
                <tdcolspan="2">
                    <asp:TextBoxID="txtboxfirst"runat="server"></asp:TextBox></td><td><asp:RequiredFieldValidatorID="RequiredFieldValidator1"runat="server"ErrorMessage="*"ControlToValidate="txtboxfirst"></asp:RequiredFieldValidator>
                    <asp:RegularExpressionValidatorID="RegularExpressionValidator1"runat="server"ErrorMessage="*"ValidationExpression="^[1-9]\d*(\.\d+)?$"ControlToValidate="txtboxfirst"></asp:RegularExpressionValidator></td>
            </tr>
            <tr>
                <tdcolspan="2">Enter Second number</td>
                <tdcolspan="2">
                    <asp:TextBoxID="txtboxsencond"runat="server"></asp:TextBox></td><td>
                    <asp:RequiredFieldValidatorID="RequiredFieldValidator2"runat="server"ErrorMessage="*"ControlToValidate="txtboxsencond"></asp:RequiredFieldValidator>
                    <asp:RegularExpressionValidatorID="RegularExpressionValidator2"runat="server"ErrorMessage="*"ValidationExpression="^[1-9]\d*(\.\d+)?$"ControlToValidate="txtboxsencond"></asp:RegularExpressionValidator>
                </td>
            </tr>
            <tr>
                <tdcolspan="2">Result</td>
                <tdcolspan="2">
                    <asp:TextBoxID="txtResult"runat="server"Enabled="false"></asp:TextBox></td>
            </tr>
            <tr>
                <td>
                    <asp:ButtonID="btnAdd"runat="server"Text="+"OnClick="btnAdd_Click"Width="49px"/></td>
                <td>
                    <asp:ButtonID="btnSub"runat="server"Text="-"OnClick="btnAdd_Click"Width="49px"/></td>
                <td>
                    <asp:ButtonID="btnMul"runat="server"Text="*"OnClick="btnAdd_Click"Width="49px"/></td>
                <td>
                    <asp:ButtonID="btnDiv"runat="server"Text="/"OnClick="btnAdd_Click"Width="49px"/></td>
            </tr>
        </table>
    </form>
</body>
</html>

2. Write in Default.aspx.cs

using System;
using System.Collections.Generic;
using System.Linq;
using System.Web;
using System.Web.UI;
using System.Web.UI.WebControls;
using System.Collections;
namespace EnumExample
{
    public partial class Default : System.Web.UI.Page
    {
      
        protected void Page_Load(object sender, EventArgs e)
        {
 
        }
 
        enum Operation { Add = '+', Mul = '*', Sub = '-', Div = '/' }

        protectedvoid btnAdd_Click(object sender, EventArgs e)
        {
            Button btn = (Button)sender;
 
 //Convert button text to enum
            Operation type = (Operation)char.Parse(btn.Text);
            switch(type) 
            {
caseOperation.Add:
                    txtResult.Text=Convert.ToString(Convert.ToDouble(txtboxfirst.Text) + Convert.ToDouble(txtboxsencond.Text));
                    break;
             caseOperation.Div:
                    txtResult.Text = Convert.ToString(Convert.ToDouble(txtboxfirst.Text) / Convert.ToDouble(txtboxsencond.Text));
                    break;
             caseOperation.Mul:
                    txtResult.Text = Convert.ToString(Convert.ToDouble(txtboxfirst.Text) * Convert.ToDouble(txtboxsencond.Text));
                    break;
             caseOperation.Sub:
                    txtResult.Text = Convert.ToString(Convert.ToDouble(txtboxfirst.Text) - Convert.ToDouble(txtboxsencond.Text));
                    break;
 
        }
        }
    }
}

Output:

Advantage:

1. In future, you can easily change values.

2. Your code can be read easier.

c# asp.net

Updated 22-Feb-2018

blog

Enumerations in c#

Definition:

Example:

1. Create a Default.aspx

priyanka kushwaha

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