---
title: "Use Delegate In WinForm"  
description: "None"  
author: "Kenny Tangnde"  
published: 2011-12-31  
updated: 2020-08-21  
canonical: https://www.mindstick.com/articles/852/use-delegate-in-winform  
category: "c#"  
tags: ["c#"]  
reading_time: 1 minute  

---

# Use Delegate In WinForm

The following is the clsMaths class declaration is:

```
using System;using System.Collections.Generic;using System.Linq;using System.Text; namespace UseDelegate{    class clsMaths    {        public delegate int PointerMaths(int i, int y);//declare delegate        public PointerMaths getPointer(int intOperate) //definition delegate object        {            PointerMaths objpointer = null;            if (intOperate==1)            {         
                    objpointer = Add;            }            else if (intOperate==2)            {                objpointer= Sub;            }            else if (intOperate==3)            {                objpointer = Multi;            }            else if (intOperate==4)            {                objpointer = Div;            }            return objpointer;        }         #region  Maths Methods        private int Add(int i, int y)        {            return i + y;        }        private int Sub(int i, int y)        {            return i - y;        }        private int Multi(int i, int y)        {            return i * y;        }        private int Div(int i, int y)        {            return i / y;        }#endregion    } } 
```

## \

## \

```
using System;using System.Collections.Generic;using System.ComponentModel;using System.Data;using System.Drawing;using System.Linq;using System.Text;using System.Windows.Forms; namespace UseDelegate{    public partial class Form1 : Form    {        public Form1()        {            InitializeComponent();        }         private void button1_Click(object sender, EventArgs e)        {            clsMaths objMath = new clsMaths();            int intOperatio = Convert.ToInt32(textBox3.Text);            int intNumber1 = Convert.ToInt32(textBox1.Text);            int intNumber2 = Convert.ToInt32(textBox2.Text);            int intResult =objMath.getPointer(intOperatio).Invoke(intNumber1, intNumber2);  //Invoke:for delegate to call method             label1.Text= "Result Is:"+intResult.ToString();        }    }}
```

Let's look at operating [results](https://yourviews.mindstick.com/view/88282/boost-your-career-mindstick-technical-training-that-delivers-results):\

![Delegate with Event in c#.Net.](https://www.mindstick.com/mindstickarticle/f251c972-3d87-4b31-9cbd-9de5c22c43ae/images/4c901b82-f79a-44c0-9fb3-230d35820e70.png)

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Original Source: https://www.mindstick.com/articles/852/use-delegate-in-winform

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