How to pass value from one Winform to another Winform in c#

Suppose we have to pass value from LoginPage.cs to HomePage.cs like Username & Role (whatever as per requirement)

Here the simplest code for it :

1) LoginPage.cs

on btnLogin Click :

[ write your code to connect the user with database and if user is valid ... ]

private void btnLogin_Click(object sender, EventArgs e)

        {

            using (SqlConnection con = new SqlConnection(CS))

            {

                con.Open();

                SqlCommand cmd = new SqlCommand("Select * from Users where Username='" + txtUsername.Text + "' and Password='" + txtPassword.Text + "'", con);

                SqlDataReader dr = cmd.ExecuteReader();

                if (dr.Read())

                {

                    this.Hide();

                    HomePage frm = new HomePage();

                    frm.UserName = txtUsername.Text;

                    frm.Show();

                }

                else

                {

                    MessageBox.Show("Username or Password incorrect", "Login Error", MessageBoxButtons.OK, MessageBoxIcon.Error);

                }

            }

        }

2) HomePage.cs

You have to declare / initialize some public string ... like

public HomePage()

        {

            InitializeComponent();

        }

        public string UserName;

        private void HomePage_Load(object sender, EventArgs e)

        {

           

            lblUserName.Text = UserName;

        }

that's it;

on LoginPage's btnLogin button click it will save/pass values to HomePage.cs public string... and that values will be send to HomePage.cs [call it on HomePage.cs Load Event].