How to open a second form using first form in window form

                                                                                                                                           
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Here i will explain how to open second from using first form in window form.Before this i explain that group box and picture box in window form.

Step(1):  Login form

There is a login from when i enter correct password and username then page direct to another page name is 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 window form and give a name it as form2
 

And new form is

Step(3):  Coding

now click on submit button and write a 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 submit button there will open a new form name is form2
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