private void btnLogin_Click(object sender, EventArgs e) { SqlConnection sqlcon = new SqlConnection(@"Data Source=(LocalDB)\MSSQLLocalDB;AttachDbFilename=C:\Users\Amanda Bakalarczyk\source\repos\EARS\EARS\EARS_DB.mdf;Integrated Security=True;Connect Timeout=30"); String query = "SELECT * FROM Login_Table WHERE username ='******' AND password = '******'"; SqlDataAdapter adapter = new SqlDataAdapter(query, sqlcon); DataTable dtbl = new DataTable(); adapter.Fill(dtbl); if (dtbl.Rows.Count == 1) { Main_Form main = new Main_Form(); this.Hide(); main.Show(); } else { MessageBox.Show("Incorrect username or password"); } }