///Constructor /// <summary> /// In form constractor the connection is created. /// Then the DataGridView of the form(MainGridView) is fill up with the users table from databse. /// </summary> public MainForm() { DCom.Connect(); LoginForm loginForm = new LoginForm(); loginForm.ShowDialog(); if (loginForm.DialogResult == DialogResult.No) { loginForm.Dispose(); DCom.Close(); Environment.Exit(1); } else { InitializeComponent(); MainGridView.DataSource = DCom.GetData(SqlUsers); } }