How to Open a Second Form Using First Form in Windows Forms

Here I will explain how to open a second from using a first form in Windows Forms. Before that I will explain group boxes and picture boxes in Windows Forms.

Step 1: Login form

There is a login from when I enter a password and username and then the page goes directly to another page named form2.

Step 2: Add a new form

Now go to Solution Explorer and select your project and right-click on it and select a new Windows Forms form and provide the name for it as form2.

And the new form is:

Step 3: Coding

Now click the submit button and write the code.

 

using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.Text;
using System.Windows.Forms;
using System.Data.SqlClient;
namespace First_Csharp_app
{
    public partial class Form1 : Form
    {
        public Form1()
        {
            InitializeComponent();
        }
        private void button1_Click(object sender, EventArgs e)
        {
            try
            {
                if (!(usertxt.Text == string.Empty))
                {
                    if (!(passtxt.Text == string.Empty))
                    {
                        String str = "server=MUNESH-PC;database=windowapp;UID=sa;password=123";
                        String query = "select * from data where username = '" + usertxt.Text + "'and password = '" + this.passtxt.Text + "'";
                        SqlConnection con = new SqlConnection(str);
                        SqlCommand cmd = new SqlCommand(query, con);
                        SqlDataReader dbr;
                        con.Open();
                        dbr = cmd.ExecuteReader();
                        int count = 0;
                        while (dbr.Read())
                        {
                            count = count + 1;
                        }
                        if (count == 1)
                        {
                            this.hide();
                            Form2 f2 = new form2(); //this is the change, code for redirect
                            f2.ShowDialog();
                        }
                        else if (count > 1)
                        {
                            MessageBox.Show("Duplicate username and password", "login page");
                        }
                        else
                        {
                            MessageBox.Show(" username and password incorrect", "login page");
                        }
                    }
                    else
                    {
                        MessageBox.Show(" password empty", "login page");
                    }
                }
                else
                {
                    MessageBox.Show(" username empty", "login page");
                }
                // con.Close();
            }
            catch (Exception es)
            {
                MessageBox.Show(es.Message);
            }
        }
    }
}

Step 4: Output

When you click on the submit button a new form will be opened named form2.