How to update data in gridview

void UpdateGrid()
    {
       
        // Open connection
        using (SqlCeConnection c = new SqlCeConnection("ConnectionString"))
        {
        c.Open();
        // 2
        // Create new DataAdapter
        using (SqlCeDataAdapter a = new SqlCeDataAdapter("SELECT * FROM table WHERE empID="+EmpId, c))
        {
            // 3
            // Use DataAdapter to fill DataTable
            DataTable t = new DataTable();
            a.Fill(t);
            // 4
            // Render data onto the screen
            dataGridView1.DataSource = t;
        }
        }
    }