DataGridViewComboBoxCell cbCell = new DataGridViewComboBoxCell();

  string[] jgStr = new string[] {"砖混", "框混", "全框架", "其它" };

  cbCell.DataSource = jgStr;

  cbCell.Value =“框混”;

  dGModelInfo.Rows[rowCount].Cells["Value"] = cbCell;

 private void dataGridView1_EditingControlShowing(object sender, DataGridViewEditingControlShowingEventArgs e)

         {

             if (e.Control is DataGridViewTextBoxEditingControl)

             {

                 TextBox textbox = (TextBox)e.Control;

                 // Panel p = (Panel)textbox.Parent;       //找到当前的父控件，其实就是一个Panel，你将此Panel中的控件清空，然后你就可以在Panel中加入任何控件并随意布局了

                 Panel p = (Panel)e.Control.Parent;

                 p.Controls.Clear();

                 Button btn =new Button();

                 btn.Text="aaa";

                 btn.Click +=new EventHandler(btn_Click);

                 p.Controls.Add(btn);

             }

         }