C# If Else

C# If-Else

The if statement is to test the given condition and execute the specific code based on the condition whether it's true or false. Same as any other programming language, C# also provides various types of if statements.

Let's take a look at an example of an if statement first and then we will see the If-Else statement code.

 
//Code syntax
if (condition) 
{
    // If the condition is true then execute the block of code
}
}

 
using System;
                
public class Program
{
    public static void Main()
    {
        //Checking 10 is greater than 5 or not? 
        if (10 > 5 )  
        {  
            Console.WriteLine("Yes, the given condition is true"); 
        }  

      //Output: Yes, the given condition is true
    }
}

 
using System;
                
public class Program
{
    public static void Main()
    {
        //Using variables
        int x = 10;
        int y = 5;
        
        //Checking 10 is greater than 5 or not? 
        if (x > y )  
        {  
            Console.WriteLine("Yes, the given condition is true"); 
        }  
        
        //Output: Yes, the given condition is true
    }
}

Let's use the If-Else statement.

 
//Code syntax using else 
if (condition) 
{
    // If the condition is true then execute the block of code
}
else
{
   // If the condition is false then execute the block of code
}
}

 
using System;
                
public class Program
{
    public static void Main()
    {
        //Using variables
        int x = 10;
        int y = 50;
        
        //Checking 10 is greater than 50 or not? 
        if (x > y )  
        {  
            Console.WriteLine("Yes, the given condition is true"); 
        }
        else
        {
            Console.WriteLine("No, the given condition is false"); 
        }
        
        //Output: No, the given condition is false
    }
}

We can also have a nested type of If statement. Let's take an example of it.

 
using System;
                
public class Program
{
    public static void Main()
    {
        //Using variables
        int x = 10;
        int y = 5;
        
        //Checking 10 is greater than 5 or not? 
        if (x > y )  
        {  
            //Nested If-Else
            if(x == 10)
            {
                Console.WriteLine("Yes, the given condition is true and the value of x is 10"); 
            }
            else
            {
                Console.WriteLine("Yes, the given condition is true but the value of x is not 10"); 
            }
        }
        else
        {
            Console.WriteLine("Yes, the given condition is false"); 
        }
        
        //Output: Yes, the given condition is true and the value of x is 10
    }
}

In C#, we can also have a ladder-type of the If-Else-If statement.

 
using System;
                
public class Program
{
    public static void Main()
    {
        //Using variables
        int nNum = 35;
        if(nNum >= 0 && nNum < 25)	
        {
            Console.WriteLine("nNum value is between 0 - 25");
        }
        else if(nNum >= 25 && nNum < 50)
        {
            Console.WriteLine("nNum value is between 25 - 50");
        }
        else if(nNum >= 50 && nNum < 75)
        {
            Console.WriteLine("nNum value is between 50 - 75");
        }
        else if(nNum > 75 && nNum < 100)
        {
            Console.WriteLine("nNum value is between 75 - 100");
        }
        else
        {
            Console.WriteLine("nNum value is greater than 100");
        }
        
        
        //Output: nNum value is between 25 - 50
    }
}