How to execute in one case, other cases? I could just copy paste those other cases, or put it to some external function but there is so much code so I dont want to do that.

Example:

 switch(foo) 
 {     
    case 3:     
    {             
        //something     
    }break;          
    
    case 4:     
    {             
        //something else     
    }break;      
    
    case 5:     
    {             
        //here i want to execute case 3 and case 4     
    }break;      
}

I think that this was previously answered but I can’t find how to do it.

>Solution :

C# doesn’t have such functionality. You have to create other methods which will do actions for cases 3 and 4 and call them from case 5 branch. I would suggest to create a separate class FooHandler which would handle your value. It’s easily extendable and readable.

public class FooHandler
{
    private readonly int _foo;

    public FooHandler(int foo)
    {
        this._foo = foo;
    }

    public void Handle()
    {
        switch(this._foo) 
        {     
            case 3: this.HandleCase3(); break;          
            case 4: this.HandleCase4(); break;
            case 5: this.HandleCase5(); break;
            default: throw new ArgumentException("Foo value is invalid");
        }
    }
    
    private void HandleCase3()
    {
        // Your code for case 3
    }

    private void HandleCase4()
    {
        // Your code for case 3
    }

    private void HandleCase5()
    {
        this.HandleCase3();
        this.HandleCase4();
    }
}

Usage:

var fooHandler = new FooHandler(foo);
fooHandler.Handle();