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.

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