dataGridView1.DataSource = bindingSource1;
bindingSource1.DataSource = db.Customers.AsQueryable();
 

bindingSource1.Current

int index = items.FindIndex(delegate(Item i) { return i.Artist.Contains(textbox1.Text; });

dataGridView1.CurrentCell = dataGridView1[ 0 , index];

       
    class FindRow
        {
            public int RowIndex { get; set; }
            public string FieldValue { get; set; }
        }
 IEnumerable<FindRow> f;
        int iposfind =  0 ;
        private void find_Click(object sender, EventArgs e)
        {
            if (f == null){
                f = query.AsEnumerable().Select((c, i) => new FindRow { RowIndex = i, FieldValue = c.CompanyName })
                   .Where(c => c.FieldValue.Contains(textBox2.Text)).AsEnumerable();
            iposfind =  0 ;
            }             
            if ((f != null)&&(iposfind < f.Count()))
            {
                this.Text = String.Format("Text  {0}, position{1}", textBox2.Text, f.ElementAt(iposfind).RowIndex);
                bindingSource1.Position= f.ElementAt(iposfind++).RowIndex;
                
            }
}