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Key Related Events in C# .Net

15 October, 2020

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Key Related Events

  1. KeyPress
  2. Key down
  3. Key Up

 The difference between Keypress and Key down:

  • In key press, logic will be executed Before displaying a character
  • In key down, logic will be executed After displaying a character
  • Key board character are divided into two types:-

  Screenshot_70  

 

Interested in mastering .NET? Learn more about ".NET Training "in this blog post.

Example of developing a Ball and Bat game:

Screenshot_71    

  • Open WFAP
  • Place a Label control arrrow properties arrrow

Back  Color = black Auto Size  = false Location  = 202, 440 Left,    top

  • Place a Picture Box Control arrrow Properties arrrow

Image = Select an image Size mode  = Stretch image Location  = 13, 200 Left,    top

  • Place a Timer with Enabled = true;
  • Place one more Timer with Enabled = false
  • Code for Form1_Keydown event
{

Int I = (int) e.  keycode;

//Message Box. Show (I + “”);

If ((I = = 37)  && Label1.left > 0 )

Label 1.left = Label1.left -3;

If ((I = = 39)  && Label1.left < this. Width - 100 )

Label 1.left = Label1.left +3;

}
  • Code for Timer 1 _ Tick Event
{

Picture Box. Top = Picture Box 1. Top – 15;

If (Picture Box. Top  < 0)

{

Timer 1. Enabled = false;

Timer 1. Enabled = true;

}

Code for Timer 2 _ Tick Event

{

Picture Box1. Top = Picture Box 1. Top +5;

Picture Box2. Left = Picture Box 1. Left +1;

If  (Picture Box1. Top = Label1.Top && Picture Box1.left  >Label1.left && Picture Box1. Left  < Label1.right )

{

Timer 1.enabled = true;

Timer 2.enabled = false;

}

  Screenshot_72    

2.Every item will be identified with a unique index number which tarts always from zero.  

Screenshot_73  

  1. Como box allows to select only one item at a time
  2. The list box allows to select multiple items also.

 

Check Out .Net Tutorial

Common Properties and methods of list box and combo box:- 

Properties:-  

  1. Items arrrowused to add items at design time
  2. Selected item
  3. Selected Index

  Methods: -

  Screenshot_74  

  1. Combo box1. Items Add (String)
  2. Combo box1. Items Insert(index, String)
  3. Combo box1. Items Remove(String)
  4. Combo box1. Items Remove(index)
  5. Combo box1. Items clear();
  6. Combo box1. Items Index of (String)
  7. Combo box1. Items Countà(property)
  8. Combo box1. Items Get Enumerator ();  

 Example on combo box:-

A program to change the shape of  a FORM

  Screenshot_75  

Namespace arrrowSystem Drawing. Drawing 2 D

Screenshot_76

  • Open WFAP
  • Place a combo box arrrowproperties arrrow Items = add

 

  • Using System . Drawing . Drawing 2 D;
  • Code for combo box 1 _ Selected Index changed Event

  Graphics path g = new Graphics path ();

Int I = combo box 1. Selected index;

If  (I = = 0) //circle

  1. Add Ellipse (10, 10, 150, 150) ;

else if (i ==1 ) //ellipse

  1. Add Ellipse (10, 10, 150, 400) ;

else //triangle {

  1. Add Line (10, 10, 200, 300) ;
  2. Add Line (200, 300, 100, 150) ;
  3. Add Line (100, 150, 10,10) ;

} Screenshot_78    

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