how to select rows in datagrid view using arrow keys on keyboar

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C#3.5

hi, i have a datagrid view, in that im selecting a row or cell with mouse so that the data in the colums/row/cells are displaying in textboxes....

whatever the cell i click the entire data of row in datagrid is displaying in the textbox...
here what i want is , not only the mouse, but when every i press down arrow key or up arrow key in keyboar, i must select upper row or lower row and the data should display in the text boxes....

can u please help me in this logic....



the code i written to select and display in the textboxes is...

private void cut_grid_CellContentClick(object sender, DataGridViewCellEventArgs e)
        {

            if (e.RowIndex >= 0)
            {
                cut_grid.SelectionMode = DataGridViewSelectionMode.FullRowSelect;
                DataGridViewRow row = this.cut_grid.Rows[e.RowIndex];
                cut_code.Text = row.Cells["Customer_Code"].Value.ToString();
                cut_name1.Text = row.Cells["Customer_Name"].Value.ToString();
                cut_name2.Text = row.Cells["Customer_Name2"].Value.ToString();
                iadd1.Text = row.Cells["Invoice_Address"].Value.ToString();
                iadd2.Text = row.Cells["Invoice_Address2"].Value.ToString();
                iadd3.Text = row.Cells["Invoice_Address3"].Value.ToString();
                iadd4.Text = row.Cells["Invoice_Address4"].Value.ToString();
}