What's the reason?

Question

Q1. Why use "+ =" ?

Student_dataListView.CellClick += Student_dataListView_CellClick;

Q2. How to do if I want to check a mouse DoubleClick rather then a CellClick?

Answer 1

@BenTam , Welcome to Microsoft Q&A,

Q1. Why use "+ =" ?

The CellClick is an event, which is a special delegate. We could use '+=' to subscribe to events, you could refer to the Microsoft doc How to subscribe to and unsubscribe from events to know more about it.

Q2. How to do if I want to check a mouse DoubleClick rather then a CellClick?

We could use the following code to subscribe to the correspond events.

 public Form1()  
        {  
            InitializeComponent();  
            dataGridView1.CellClick += DataGridView1_CellClick;  
            dataGridView1.MouseDoubleClick += DataGridView1_MouseDoubleClick;  
        }  

        private void DataGridView1_MouseDoubleClick(object sender, MouseEventArgs e)  
        {  
            // Do Something  
        }  

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