http://gxlxzys.cnblogs.com/

DatagridView中验证数据错误后仍把焦点定在该单元格
http://jeffsonglove.blog.sohu.com/83683437.html

dataGridView使用指南系列一、回车换行或换列完美解决方案
http://www.cndvp.com/bbs/TopicList/c9def300-cbe6-4541-895f-c11bae68fa1f.aspx
http://blog.csdn.net/dengkun39/archive/2008/11/22/3352226.aspx
http://www.cnblogs.com/gxlxzys/archive/2010/03/28/1699014.html

using System;
using System.Collections.Generic;
using System.Text;
using System.Windows.Forms;
namespace WindowsApplication1
{
    public class CustomDataGridView : DataGridView
    {
        protected override bool ProcessDialogKey(Keys keyData)
        {
            Keys key = (keyData & Keys.KeyCode);
            if (key == Keys.Enter)
            {
                return this.ProcessRightKey(keyData);
            }
            return base.ProcessDialogKey(keyData);
        }
        public new bool ProcessRightKey(Keys keyData)
        {
            Keys key = (keyData & Keys.KeyCode);
            if (key == Keys.Enter)
            {
                //第一种情况：只有一行,且当光标移到最后一列时
                if ((base.CurrentCell.ColumnIndex == (base.ColumnCount - 1)) && (base.RowCount == 1))
                {
                    base.CurrentCell = base.Rows[base.RowCount - 1].Cells[0];
                    return true;
                }
                //第二种情况：有多行，且当光标移到最后一列时,移到下一行第一个单元
                if ((base.CurrentCell.ColumnIndex == (base.ColumnCount - 1)) && (base.CurrentCell.RowIndex < (base.RowCount - 1)))


                {
                    base.CurrentCell = base.Rows[base.CurrentCell.RowIndex + 1].Cells[0];
                    return true;
                }
                return base.ProcessRightKey(keyData);
            }
            return base.ProcessRightKey(keyData);
        }
 
        protected override bool ProcessDataGridViewKey(KeyEventArgs e)
        {
            if (e.KeyCode == Keys.Enter)
            {
                return this.ProcessRightKey(e.KeyData);
            }
            //if (e.KeyCode == Keys.F4)
            //{
            //    return this.ProcessRightKey(e.KeyData);
            //}
            return base.ProcessDataGridViewKey(e);
        }
    }
}