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