if (e.KeyCode == Keys.Enter)

            {

                //this.SelectNextControl(this.ActiveControl,true, true, true, true);

                SendKeys.Send("{Tab}");  //向活动应用程序发送击键 注意格式：Send("{Tab}");中的{}

            }

/// <summary>

/// 窗体控件控制相关的方法

/// </summary>

public class ControlTools

{

    private Form frm;

    public ControlTools(Form frm)

    {

      this.frm = frm;

    }

    /// <summary>

    /// 窗体上所有子控件的回车设成Tab

    /// </summary>

    public void EnterToTab()

    {

      frm.KeyPreview = true;

      frm.KeyPress += new KeyPressEventHandler(frm_KeyPress);

    }

    /// <summary>

    /// 注册窗体的KeyPress事件

    /// </summary>

    /// <param name="sender"></param>

    /// <param name="e"></param>

    private void frm_KeyPress(object sender, KeyPressEventArgs e)

    {

      if (e.KeyChar == (char)Keys.Enter)

      {

        frm.SelectNextControl(frm.ActiveControl, true, true, true, true);

      }

    }

    /// <summary>

    /// 把某一个控件的所有子控件(TextBox ComboBox)的回车设成Tab

    /// </summary>

    /// <param name="groupControl">容器控件</param>

    public void EnterToTab(Control groupControl)

    {

      foreach (Control control in groupControl.Controls)

      {

        if (control is TextBox || control is ComboBox)

          control.KeyPress += new KeyPressEventHandler(control_KeyPress);

      }

    }

    /// <summary>

    /// 注册控件的KeyPress事件

    /// </summary>

    /// <param name="sender"></param>

    /// <param name="e"></param>

    private void control_KeyPress(object sender, KeyPressEventArgs e)

    {

      if (e.KeyChar == )

      {

        SendKeys.Send("{Tab}");

        e.Handled = false;

      }

    }

}