How to add Row to dataGridView from user control

Question

I have this form with a button and َPanel. When I press the button I want to add a Row to dataGridView1

User control code:

public partial class UserControl1 : UserControl
{
    private static UserControl1 _instance;
    public static UserControl1 Instance
    {
        get
        {
            if (_instance == null)
                _instance = new UserControl1();
            return _instance;
        }
    }
    public UserControl1()
    {
        InitializeComponent();
    }
    public void setRow()
    {
        String[] row = { "TEST", "TEST", "TEST", "TEST" };
        dataGridView1.Rows.Add(row);
    }
}

Form1 code:

public partial class Form1 : Form
{
    public Form1()
    {
        InitializeComponent();
        panel1.Controls.Add(new UserControl1());
        UserControl1.Instance.Dock = DockStyle.Fill;
        UserControl1.Instance.BringToFront();
    }

    private void Form1_Load(object sender, EventArgs e)
    {

    }


    private void button1_Click(object sender, EventArgs e)
    {
        UserControl1 user = new UserControl1();
        user.setRow();
    }

    private void button2_Click(object sender, EventArgs e)
    {

    }
}

Answer 1

private void button1_Click(object sender, EventArgs e)
{
    UserControl1 user = new UserControl1();
    user.setRow();
}

Should be

private void button1_Click(object sender, EventArgs e)
{
    UserControl1.Instance.setRow();
}

and constructor of UserControl1 should look like

public UserControl1()
{
    _instance = this;
    InitializeComponent();
}

In your code you are creating 3 instances of your UserControl and it seems like you want to only have one. When you call a method on one of those instances it doesnt in no way influence the other instances.