//删除，行删除

         private void 删除_Click(object sender, EventArgs e)

         {

             int dgrcount = dataGridView1.SelectedRows.Count;

             if (dgrcount>)

             {

                 string selectedRowName=dataGridView1.SelectedRows[].Cells[].Value.ToString();//获取选中的行的用户名

                 string cmdText = "delete from tb_admin where 用户名='" + selectedRowName + "'";//构建删除行语句

                 OleDbConnection conn = new OleDbConnection();

                 conn.ConnectionString = "Provider=Microsoft.Jet.OLEDB.4.0;Data source=ErLake.mdb";

                 OleDbCommand cmd = new OleDbCommand(cmdText, conn);

                 conn.Open();

                 //逐行删除

                 foreach (DataGridViewRow dgvRow in dataGridView1.SelectedRows)

                 {

                     dataGridView1.Rows.Remove(dgvRow);//删除dataGridView中的数据

                     cmd.ExecuteNonQuery();//删除数据库表中的数据

                 }

                 conn.Close(); 

             }

         }