Data Grid View in windows application

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C#

Hi All
I am using C# windows application
Here I am not taking data grid view from ToolBox But I am trying to do this as run time Below the code

public partial class Form1 : Form
    {
        DataGridView dataGrid;
        DataSet dataSet;        
        OleDbDataAdapter da;       
        private OleDbConnection conn = new OleDbConnection();        
        private string conStr = "Provider=SQLOLEDB;Data Source=SERVICE\\SQLEXPRESS;Initial Catalog=Test;Integrated Security=SSPI";
        public Form1()
        {
            InitializeComponent();
            conn = new OleDbConnection(conStr);
            conn.Open();
            InitializeComponent();
            //CreateGridAndButton();
        }

        private void Form1_Load(object sender, EventArgs e)
        {

            string str = "SP_TestForAccess";
            OleDbCommand cmd = new OleDbCommand();
            cmd = new OleDbCommand(str, conn);
            dataGrid=new DataGridView();
            da = new OleDbDataAdapter();
            DataTable dt = new DataTable();
            dataSet = new DataSet();
            da.SelectCommand = cmd;
            //dt.Load(dr);
            //dataSet.Tables.Add(dt);
            da.Fill(dataSet, "tbl_main");
            dataGrid.DataSource = dataSet.Tables[0].DefaultView;            
        }        
    }

in Data set it shows the data but after run in the windows form Data grid view does not show any thing.
why it is happening like this

Thanks to All