What is the purpose of main() function
in C# (C Sharp)?

namespace Application1 {
public class sampleClass {
public static void sampleMethod() {
Console.WriteLine("Executing sampleMethod..");
}
}
}

When you execute the above program, you will end up in the following error:
Program ‘Application1.exe' does not contain a static 'Main' method suitable for an entry point

This is because the above program does not include Main function. To make it work, include the following Main function inside sampleClass:

public static void Main() {
sampleMethod();
}

Now when you execute the program, you will get the following output:
Executing sampleMethod..

The Main function can take four different forms. They are mentioned below:

static void Main() { }
static void Main(string[ ]args) { }
static int Main() { }
static int Main(string[ ] args) { }

But remember that your program can have only one Main function which can have any of the above shown signatures. If multiple Main functions are defined, then you will get this error:
Program ‘Application1.exe' has more than one entry point defined: 'Application1.sampleClass.Main()'

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