Conditional Statements

Syntax of if condition :

Syntax 1 

If (condition)

Statement 1 ;

Else Statement 2;

Syntax 2

If (condition)

{

Statement 1 ;

Statement 2;

}

Else

{

Statement 3;

Statement 4;

}

Nested If:-

If (condition)

Statement 1 ;

Else If (condition)

Statement 1 ;

Else If (condition)

Statement 1 ;

Else

.

Else Statement; 

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Examples of if statement

A program to compare two numbers  (I and j), if I is greater change from back color to green otherwise REO.

Open windows form application project

Place two text boxes and a button

Click on button 1

Code for button 1  

Int I = int. parse (text Box 1. text);

Int j =int. parse (text Box2.text);

If (i> j)

This. Back color = color. Green;

Else

This. Back color = color. Red;

Execute the project

Observations

What is this key?

this is a keyword

this works like an object for the current class

this will be created at run time.

this is under the control of CLR.

Working with Switch condition Switch syntax

Switch (variable)

{

Case 1: Statements;

Break;

Case 2: Statements;

Break;

. Default Statements;

Break;

}

 

Example of a Switch condition

 

Open windows form application project Place a text box and a button Code for button 1 click  

{

Int  I = int. parse  (text box 1. text);

Switch (i) { …. }

//switched close here

Switch (i)

{

Case 1: This. back color = color. Green ;

Break;

Case 2 : Color dialog c = new dialog ();

Creating an object

show dialog ();
this. Back color = c. color;

break;

case 3: Application . Exit ();

Break;

Default : Message box . show (“enter 1,2, or 3 only”);

Break;

}

// switch closed here Execute the project

  Observations

Syntax to create an object Class name   (space)  obj _name = new  class name ();  

 

EX:-

Color dialog is a predefined class

Application is a class which contains Exit () method

Purpose of exit () is to terminate the project