What is a partial class and how to use in c sharp

It was introduced under 2.0 framework which allows you to split a class o n to multiple files
Advantages:
Splitting huge volumes of code into multiple files which makes managing easier.Allows multiple programmers to work on the same class at the same time.grouping related code of a class in separate files
Here i will show how to develop a partial class in csharp.For this add a class to the project naming it as File1.cs and write the following code

partial class parts
{
public void test1()
{
Console.Writeline("method1");
}
public void test2()
{
Console.Writeline("method2");
}
}
add one more class naming it as File2.cs

 partial class parts
{
public void test3()
{
Console.Writeline("method3");
}
public void test4()
{
Console.Writeline("method4");
}
}
Now to test the class add one more class to the project naming it as test parts.cs and write the following
class testparts
{
static void main()
{
parts p= new parts();
p.test1();
p.test2();
p.test3();
p.test4();
Console.ReadLine();

}
}