C# WinForm 取消DataGridView的默认选中Cell 使其不反蓝

dataGridView1.Rows[0].Selected = false;

默认情况下 DataGridView绑定数据后
会选中首行首列
为实现其没有默认不选中(即绑定后 看不到首行首列反蓝)
之前将
dataGridView1.Rows[0].Selected = false;
放在窗体的构造函数中 怎么都看似不起效果 首行首列还是反蓝
后来尝试放在窗体的Load中 终于看不不反蓝了
同时需要注意dataGridView1的TabIndex

相关代码如下：   

    public partial class Form1 : Form
    {
        public Form1()
        {
            InitializeComponent();
            DataTable dt = new DataTable();
            dt.Columns.Add("Column1");
            dt.Columns.Add("Column2");
            dt.Columns.Add("Column3");

            DataRow dr = dt.NewRow();
            dr["Column1"] = "1";
            dr["Column2"] = "2";
            dr["Column3"] = "3";
            dt.Rows.Add(dr);

            this.dataGridView1.AutoGenerateColumns = false;
            this.dataGridView1.DataSource = dt;
           
            //dataGridView1.Rows[0].Selected = false; //放在Form1这里不起效果 可放在下面的Form1_Load中
            this.button1.Focus();
        }

        private void Form1_Load(object sender, EventArgs e)
        {
            dataGridView1.Rows[0].Selected = false;

            //this.dataGridView1.TabStop = false;
            //dataGridView1.Rows[0].Selected = false;
            //this.dataGridView1.CurrentCell = null;
            //dataGridView1.ClearSelection();
        }
    }