How to define methods in C#?

A method is a group of statements that together perform a task. Every C# program has at least one class with a method named Main.

When you define a method, you basically declare the elements of its structure. The syntax for defining a method in C# is as follows −

<Access Specifier> <Return Type> <Method Name>(Parameter List) {
   Method Body
}

Here,

• Access Specifier − This determines the visibility of a variable or a method from another class.

• Return type − A method may return a value. The return type is the data type of the value the method returns. If the method is not returning any values, then the return type is void.

• Method name − Method name is a unique identifier and it is case sensitive. It cannot be same as any other identifier declared in the class.

• Parameter list − Enclosed between parentheses, the parameters are used to pass and receive data from a method. The parameter list refers to the type, order, and number of the parameters of a method. Parameters are optional; that is, a method may contain no parameters.

• Method body − This contains the set of instructions needed to complete the required activity.

The following is an example of methods showing how to find that a string has unique words or not. Here, we have created a C# method CheckUnique() −

Example

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;

public class Demo {

   public bool CheckUnique(string str) {
      string one = "";
      string two = "";

      for (int i = 0; i < str.Length; i++) {
         one = str.Substring(i, 1);
         for (int j = 0; j < str.Length; j++) {
            two = str.Substring(j, 1);
            if ((one == two) && (i != j))
            return false;
         }
      }
      return true;
   }
   static void Main(string[] args) {
      Demo d = new Demo();
      bool b = d.CheckUnique("amit");
      Console.WriteLine(b);

      Console.ReadKey();
   }
}

Output

True