Windows Forms - Get List of all Open Forms


Windows Forms  - Get List of all Open Forms 

Step 1 : Create new windows form application.
Step 2 : Add three win forms as Form1, Form2 and Form3 to application.
Step 3 : Design Form3 as follows
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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;  
using System.Data.SqlClient;  
namespace WindowsFormsApplication1  
{  
    public partial class Form3 : Form  
    {  
        public Form3()  
        {  
            InitializeComponent();  
        }  
  
        private void Form3_Load(object sender, EventArgs e)  
        {  
            label3.Text = Application.OpenForms.Count.ToString();  
            foreach (Form frm in Application.OpenForms)  
            {  
                label1.Text = frm.Name;  
            }  
        }  
  
        private void button1_Click(object sender, EventArgs e)  
        {  
            Form1 frm1 = new Form1();  
            frm1.Show();  
        }  
  
        private void button2_Click(object sender, EventArgs e)  
        {  
            Form2 frm2 = new Form2();  
            frm2.Show();  
        }  
  
        private void button3_Click(object sender, EventArgs e)  
        {  
            label3.Text = Application.OpenForms.Count.ToString();  
            label1.Text = "";  
            foreach (Form frm in Application.OpenForms)  
            {  
                label1.Text += frm.Name + "\n";  
            }  
        }  
    }  
 
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 After running application you will get above output. It show the count of open form as 1 and that one form is Form3.
 Step 7 : Open Form1 and Form2 by clicking on button Form1 and Form2.
 Step 8 : Then click on Get list button to get list of open form as follows


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