title: Enabling a button from another form and closing the form
body: <p>I have Form1 and Form2</p>
  
  <p>Form1 I have a button that is disabled, but if I click on the menustrip on Form1 I go to Form2. On Form2 I log into a database. After I logged in successfully, I want Form2 to close and I want the button on Form1 to be enabled.</p>
  
  <p>Here is my code:</p>
  
  <pre><code>private void button1_Click(object sender, EventArgs e)
  {
      SqlConnection connection = new SqlConnection(@"...");
      SqlCommand command = new SqlCommand("SELECT * FROM UserT WHERE UserName ='" + 
          textBox1.Text + "' AND password ='" + 
          textBox2.Text + "'", 
          connection);
  
      connection.Open();
      SqlDataReader reader = null;
      reader = command.ExecuteReader();
      if (reader.Read())
      {
          MessageBox.Show("Welcome " + reader["UserName"].ToString());
          Form1 lfm = new Form1();
          lfm.button1.Enabled = true;
          Form2 fm = new Form2();
          fm.Close();
      }
      else
      {
          MessageBox.Show("Username and password " + 
              textBox1.Text + "does not exist");
      }
  }
  </code></pre>