方法一：
后台代码：

 protected void btn_delete_Click(object sender, EventArgs e)
    {
        for (int i = 0; i         {
            int id = Convert.ToInt32(this.GridView1.DataKeys[i].Value);
            if ((this.GridView1.Rows[i].Cells[0].FindControl("CheckBox1") as CheckBox).Checked == true)
            {
                Delete(id);
                ClientScript.RegisterStartupScript(GetType(),"提示","");
            }
        }
        this.GridView1.DataBind();
    }//删除
    private void Delete(int id)
    {
        using (SqlConnection conn = new SqlConnection(str))
        {
            conn.Open();
            SqlCommand comm = conn.CreateCommand();
            comm.CommandText = "delete from Notice_Msg where id=@id";
            comm.Parameters.Add(new SqlParameter("@id", id));
            comm.ExecuteNonQuery();
        }
    }

前台代码：

另外还得添加一列，让其绑定的字段为id，并且把这一列的visable属性设为false
方法二：
后台：

 protected void btn_delete_Click(object sender, EventArgs e)
    {
        foreach (GridViewRow row in this.GridView1.Rows)
        {
            if (row.RowType == DataControlRowType.DataRow)
            {
                CheckBox ckb = row.Cells[2].FindControl("CheckBox1") as CheckBox;
                if (ckb.Checked)
                {
                    using (SqlConnection sqlCnn = new SqlConnection(str))
                    {
                        using (SqlCommand sqlCmm = sqlCnn.CreateCommand())
                        {
                            sqlCmm.CommandText = "delete from Regime_Table where id='" + row.Cells[0].Text + "' ";
                            sqlCnn.Open();
                            int a= sqlCmm.ExecuteNonQuery();
                            if (a>0)
                            {
                                ClientScript.RegisterStartupScript(GetType(),"提示","");
                            }
                            else
                            {
                                ClientScript.RegisterStartupScript(GetType(), "提示", "");
                            }
                            this.DataBind();
                        }
                    }
                }
            }
        }
    }

前台：

新增加一列，这一列绑定id字段，并且visable属性不能为false,否则取不出值来。

checkbox全选功能：

     
             全选