Override the DefaultSize property to gain better performance : Control : GUI Windows Forms C# Examples

    
using  System;
using  System.Drawing;
using  System.Windows.Forms;

public  class  FormWithDefaultSize  :  Form
{
    private  Button  btnShow;
    private  Button  btnChange;
    private  Label  lbl;

    protected  override  Size  DefaultSize
    {
        get
        {
            return  new  Size(400,400);
        }
    }

    public  FormWithDefaultSize()
    {
        BackColor  =  Color.LightBlue;
        ForeColor  =  Color.DarkBlue;


        btnShow  =  new  Button();
        btnShow.Location  =  new  Point(50,50);
        btnShow.Size  =  new  Size(100,23);
        btnShow.Text  =  "Show";
        btnShow.Click  +=  new  System.EventHandler(btnShow_Click);
        btnShow.Parent  =  this;

        btnChange  =  new  Button();
        btnChange.Location  =  new  Point(200,50);
        btnChange.Size  =  new  Size(100,23);
        btnChange.Text  =  "Change";
        btnChange.Click  +=  new  System.EventHandler(btnChange_Click);
        btnChange.Parent  =  this;

        lbl  =  new  Label();
        lbl.Text  =  "Control  Size  and  Location";
        lbl.Size  =  new  Size(400,25);
        lbl.Parent  =  this;
    }

    static  void  Main()  
    {
        Application.Run(new  FormWithDefaultSize());
    }

    private  void  btnShow_Click(object  sender,  EventArgs  e)
    {
        Console.WriteLine("Button  Bottom:"  +  btnShow.Bottom.ToString());
        Console.WriteLine("Button  Top:"  +  btnShow.Top.ToString()  );
        Console.WriteLine("Button  Left:"  +  btnShow.Left.ToString()  );
        Console.WriteLine("Button  Right:"  +  btnShow.Right.ToString()  );
        Console.WriteLine("Button  Location:"  +  btnShow.Location.ToString()  );
        Console.WriteLine("Button  Width:"  +  btnShow.Width.ToString()  );  
        Console.WriteLine("Button  Height:"  +  btnShow.Height.ToString()  );
        Console.WriteLine("Button  Size:"  +  btnShow.Size.ToString()  );
        Console.WriteLine("Button  ClientSize:"  +  btnShow.ClientSize.ToString()  );
        Console.WriteLine("Form  Size:"  +  this.Size.ToString()  );
        Console.WriteLine("Form  ClientSize:"  +  this.ClientSize.ToString());
    }

    private  void  btnChange_Click(object  sender,  EventArgs  e)
    {
        this.Size  =  new  Size(800,200);
    }
}