C#

internal abstract class MyFormBase : Form
{
  DataGridView dataGridView1;

  protected MyFormBase()
  {
    dataGridView1 = new DataGridView();
    dataGridView1.CellClick += OnDataGridViewCellClick;
    // Other initialization
  }

  protected virtual string Message
  {
    get { return "Message from the base class."; }
  }

  protected virtual void OnDataGridViewCellClick(object sender, DataGridViewCellEventArgs e)
  {
    // Override this in your child class if you wish.
  }

  protected virtual void OnDataGridViewColumnHeaderMouseClick(object sender, DataGridViewBindingCompleteEventArgs e)
  {
    MessageBox.Show(Message, "Test");
  }
}

internal class MyChildForm : MyFormBase
{
  protected override string Message
  {
    get { return "Message from the child class."; }
  }

  protected override void OnDataGridViewCellClick(object sender, DataGridViewCellEventArgs e)
  {
    MessageBox.Show("You clicked a cell.", "Test");

    // Example of how to call a base method. Not always required, and in this case doesn't do anyway.
    // However, for some virtual methods it's very important to call the base so read documentation.
    base.OnDataGridViewCellClick(sender, e);
  }
}

private abstract void OnDataGridViewCellClick(object sender, DataGridViewCellEventArgs e);

public abstract class Shape
{
  protected Rectangle { get; private set; }
  public Shape(Rectangle rectangle)
  {
    SetBounds(rectangle);
  }
  public void SetBounds(Rectangle rectangle)
  {
    this.Rectangle = rectangle;
  }
  public abstract void Draw();
}

public class Circle : Shape
{
  public void Draw()
  {
    // Plug the code you want in here. You've already got the bounds.
  }
}

this.ListView1.MultiSelect = true;

private void listView_MouseClick(object sender, MouseEventArgs e)
{
    foreach (ListViewItem item in listView.Items)
        item.Checked = item.Selected;
}

blocks of code
like this

0bx wrote:

In the designview

0bx wrote:

Changing the values in the gridview