Can you explain what the partial keyword means in C# and when it is used?

The partial keyword in C# allows splitting the definition of a class, struct, or interface across multiple files. This is useful when the class is large or when code is generated automatically (for example, by a form designer), and the developer wants to add their own logic in a separate file.

Example of usage:

// File1.cs
public partial class MyClass
{
    public void Method1() { /* implementation */ }
}

// File2.cs
public partial class MyClass
{
    public void Method2() { /* implementation */ }
}

During compilation, both files are combined into a single class MyClass.

partial is used for:

• Dividing a large class into logical parts.
• Collaborative work of multiple developers on a single class.
• Separating generated code from user code to avoid overwriting during regeneration.