GridView添加行我已经做了 请告诉教下怎么删除行 谢谢了

ViewState["k"] = 0;
 protected void Button1_Click(object sender, EventArgs e)
  {

  int k = Convert.ToInt32(ViewState["k"].ToString());

  k++;

  ViewState["k"] = k;

  DataTable dataTable = new DataTable();
  DataColumn column;

  for (int j = 0; j < k; j++)
  {
  column = new DataColumn();
  column.ColumnName = "COL" + j;
  dataTable.Columns.Add(column);

  DataRow row = dataTable.NewRow();
  row["COL" + j] = "001";

  dataTable.Rows.Add(row);
  }

  this.GridView1.DataSource = dataTable;
  this.GridView1.DataBind();


  ViewState["j"] = this.GridView1.Rows.Count - 1;  

  }



  if (i < 0 || this.GridView1.Rows[i].Visible == false)
  //{

  // int j = Convert.ToInt32(ViewState["j"].ToString());

  // if (this.GridView1.Rows[j].Visible == false)
  // {
  // j--;

  // ViewState["j"] = j;
  // }

  // this.GridView1.Rows[j].Visible = false;
  //}
  //else
  //{
  // this.GridView1.Rows[i].Visible = false;
  //}  


这里只是隐藏行而且 请高手 教下小弟删除行 谢谢了 非常急 在线等答案