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partial

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The keyword partial can be used during type definition of class, struct, or interface to allow the type definition to be split into several files. This is useful to incorporate new features in auto generated code.

File1.cs 

namespace A
{
    public partial class Test
    {
        public string Var1 {get;set;}
    }
}

File2.cs 

namespace A
{
    public partial class Test
    {
        public string Var2 {get;set;}
    }
}

Note: A class can be split into any number of files. However, all declaration must be under same namespace and the same assembly.

Methods can also be declared partial using the partial keyword. In this case one file will contain only the method definition and another file will contain the implementation.

A partial method has its signature defined in one part of a partial type, and its implementation defined in another part of the type. Partial methods enable class designers to provide method hooks, similar to event handlers, that developers may decide to implement or not. If the developer does not supply an implementation, the compiler removes the signature at compile time. The following conditions apply to partial methods:

– MSDN

File1.cs 

namespace A
{
    public partial class Test
    {
        public string Var1 {get;set;}
        public partial Method1(string str);
    }
}

File2.cs 

namespace A
{
    public partial class Test
    {
        public string Var2 {get;set;}
        public partial Method1(string str)
        {
            Console.WriteLine(str);
        }
    }
}

Note: The type containing the partial method must also be declared partial.

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Table Of Contents
0 Getting Started With C#
1 Literals
2 Operators
3 Conditional Statements
4 Equality Operator
5 Equals and GetHashCode
6 Null-Coalescing Operator
7 Null-Conditional Operators
8 nameof Operator
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35 Type Conversion
36 Casting
37 Nullable types
38 Constructors and Finalizers
39 Access Modifiers
40 Interfaces
41 Static Classes
42 Singleton Implementation
43 Dependency Injection
44 Partial class and methods
45 Object Initializers
46 Methods
47 Extension Methods
48 Named Arguments
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50 Data Annotation
51 Keywords
52 Recursion
53 Naming Conventions
54 XML Documentation Comments
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56 Inheritance
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69 C# 7.0 Features
70 C# 6.0 Features
71 C# 5.0 Features
72 C# 4.0 Features
73 C# 3.0 Features
74 Exception Handling
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110 Async/Await, BackgroundWorker, Task and Thread examples
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114 Task Parallel Library
115 Making a variable thread safe
116 Lock Statement
117 Yield Keyword
118 Task Parallel Library TPL Dataflow Constructs
119 Functional Programming
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121 Function with multiple return values
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124 IComparable
125 Accessing Databases
126 Using SQLite
127 Caching
128 Code Contracts
129 Code Contracts and Assertions
130 Structural Design Patterns
131 Creational Design Patterns
132 Implementing Decorating Design Pattern
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134 System.Management.Automation
135 Pointers
136 Pointers and Unsafe Code
137 Simulating C Unions with C# Structs
138 Reactive Extensions Rx
139 AsseblyInfo.cs examples
140 Creating Console Application
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142 ObservableCollection
143 Hash Functions
144 Generating Random Numbers
145 Cryptography
146 Unsafe Code in .NET
147 C# Script
148 Runtime Compile
149 Interoperability
150 .NET Compiler Platform Roslyn
151 Creating Own MessageBox in Windows Form Application
152 Including Font Resources
153 Garbage Collector
154 Windows Communication Foundation
155 Contributors