private void FormCities_Load(object sender, EventArgs e)
        {
            cmd.CommandText = "SELECT c.Id,c.Name,d.Name FROM Cities AS c LEFT JOIN Districts AS d ON d.Id = c.District_Id;";
            dsTasks.DataSetName = "LocalDataBase";
            dtTable = new DataTable();
            dtTable.TableName = "Cities";
            dsTasks.Tables.Add(dtTable);
            MDBConn.Open();
            da = new OleDbDataAdapter(this.cmd);
            OleDbCommandBuilder builder = new OleDbCommandBuilder(da);
            
            da.UpdateCommand = builder.GetUpdateCommand();
            da.InsertCommand = builder.GetInsertCommand();
            da.DeleteCommand = builder.GetDeleteCommand();
             
            int nRows = da.Fill(this.dsTasks, "Cities");
            dataGridView1.DataSource = dsTasks.Tables[0];
            FormMain.SetupDataGridView(dataGridView1);
            dataGridView1.RowHeadersVisible = true;
            dataGridView1.Columns[0].HeaderText = "Id";
            dataGridView1.Columns[0].ReadOnly = true;
            dataGridView1.Columns[1].HeaderText = "Город";
            dataGridView1.Columns[1].DefaultCellStyle.Font = FormMain.f1;
            dataGridView1.Columns[2].HeaderText = "Область";
            dataGridView1.Columns[2].DefaultCellStyle.Font = FormMain.f1;
            dataGridView1.Columns[0].Width = this.ClientSize.Width * 20 / 100;
            dataGridView1.Columns[1].Width = this.ClientSize.Width * 30 / 100;
            dataGridView1.Columns[2].Width = this.ClientSize.Width * 50 / 100;
        }

dataGridView1.DataSource = dsTasks.Tables[0];

dataGridView1.AllowUserToAddRows = false;
dataGridView1.AllowUserToDeleteRows = false;
// ну и до кучи
dataGridView1.ReadOnly = true;