public ShowingForm(int i) { InitializeComponent(); DataBase a = new DataBase(); switch (i) { case 1: DataBase db = new DataBase(); dataGridView1.DataSource = db.SelectGrodno(); dataGridView1.Refresh(); break; case 2: DataBase db1 = new DataBase(); dataGridView1.DataSource = db1.SelectMinsk(); dataGridView1.Refresh(); break; case 3: DataBase db2 = new DataBase(); dataGridView1.DataSource = db2.SelectMogilev(); dataGridView1.Refresh(); break; case 4: DataBase db3 = new DataBase(); dataGridView1.DataSource = db3.SelectVitebsk(); dataGridView1.Refresh(); break; case 5: DataBase db4 = new DataBase(); dataGridView1.DataSource = db4.SelectGomel(); dataGridView1.Refresh(); break; case 6: DataBase db5 = new DataBase(); dataGridView1.DataSource = db5.SelectBrest(); dataGridView1.Refresh(); break; } }