Can we have multiple (more than two) partial classes in c#? [duplicate]

Yes, you can create more than 2 Partial classes. (Source Here)

According to Docs:

When working on large projects, spreading a class over separate files enables multiple programmers to work on it at the same time.

Working Example

using System;

public class Program
{
    public static void Main()
    {
        Foo foo = new Foo();
        foo.PrintMessage1();
        foo.PrintMessage2();
        foo.PrintMessage3();
    }
}

public partial class Foo
{
    public void PrintMessage1()
    {
        Console.WriteLine("Foo1");
    }  
}

public partial class Foo
{
    public void PrintMessage2()
    {
        Console.WriteLine("Foo2");
    }
}

public partial class Foo
{
    public void PrintMessage3()
    {
        Console.WriteLine("Foo3");
    }
}

I would not introduce partial classes, to be able to cowork with other developers. A good practice is to use some kind of version control like Git, TortoiseSVN and TFVC. Just to name a few.

Version Control serves multiple purposes:

• Helping you collaborate. E.g. with merge features.
• Store your Versions (pretty obvious)
• Restore old Versions and Snapshots (also called Commits)
• Keep track of your changes. Review File histories, and see who wrote which code.
• Backup

Also note, that any Version Control greatly benefits from Merge Tools. These are used to merge multiple File Versions - often submitted by different developers - into one file. It is often refered to as solving merge-conflicts in Version Control.

Jumpstart into Version Control

To give you a little jumpstart, maybe try the following combination:

• GitExtensions
• Meld

Use GitExtensions as a graphical interface for the git Version Control. Use Meld to solve merge conflicts.

Summary

To use Version Control in Software development is a major bestpractice, which greatly helps in project management, agility, collaboration and documentation.

To be honest, I've never been working anywhere, where we did not use this nor do I know anyone who didn't. So even though, I'm not aware of the OP's background, I'd still suggest to give it a shot.

Also: Even the Kings of collaboration - developers working together on big opensource projects, work with Version Control. Mostly git.