How do we use nested if statements in C#?

Use one if or else if statement inside another if or else if statement(s). The syntax for a nested if statement is as follows −

if( boolean_expression 1) {
   /* Executes when the boolean expression 1 is true */
   if(boolean_expression 2) {
      /* Executes when the boolean expression 2 is true */
   }
}

The following is an example showing the usage of nested if statements in C#. Here, we have two if statement that checks two conditions.

if (a == 5) {
   /* if condition is true then check the following */
   if (b == 10) {
      /* if condition is true then print the following */
      Console.WriteLine("Value of a is 5 and b is 10");
   }
}

Here is the complete example.

Example

using System;
namespace Demo {
   class Program {
      static void Main(string[] args) {
         //* local variable definition */
         int a = 5;
         int b = 10;
         /* check the boolean condition */
         if (a == 5) {
            /* if condition is true then check the following */
            if (b == 10) {
               /* if condition is true then print the following */
               Console.WriteLine("Value of a is 5 and b is 10");
            }
         }
         Console.WriteLine("Exact value of a is : {0}", a);
         Console.WriteLine("Exact value of b is : {0}", b);
         Console.ReadLine();
      }
   }
}

Output

Value of a is 5 and b is 10
Exact value of a is : 5
Exact value of b is : 10