private void button3_Click(object sender, EventArgs e)
        {
            dataGridView1.DataSource = null;
            dataGridView1.DataSource = DALCadastro.FluxoVendaTudo1();
            decimal soma = 0;
            int     cont = 0;

            if (dataGridView1.Rows.Count > 0)
            {
                for (int i = 0; i < dataGridView1.Rows.Count; i++)
                {
                    string prazo1 = dataGridView1.Rows[i].Cells[2].Value.ToString();
                    if (prazo1 == "a prazo")
                    {
                        cont++;
                    }
                    if (prazo1 == "não definido")
                    {
                        cont++;
                    }
                    if (prazo1 == "a prazo_parcial")
                    {
                        cont++;
                    }
                    if (prazo1 == "Pagamento Misto")
                    {
                        cont++;
                    }
                    if (cont == 0)
                    {
                        soma += Convert.ToDecimal(dataGridView1.Rows[i].Cells[6].Value);
                        dataGridView1.Rows[i].Cells[6].Style.BackColor = System.Drawing.Color.Cyan;
                    }
                    cont = 0;
                }
                textBox3.Text = Convert.ToString(soma);
            }
            dataGridView2.DataSource = DALCadastro.ListaAUXVendas(monthCalendar1.SelectionStart.Date.ToShortDateString());
            if (dataGridView2.Rows.Count > 0)
            {
                for (int i = 0; i < dataGridView2.Rows.Count; i++)
                {
                    if (dataGridView2.Rows[i].Cells[5].Value.ToString() == "Pagamento Fiado Parcial" || dataGridView2.Rows[i].Cells[5].Value.ToString() == "Pagamento Misto")
                    {
                        soma = soma + Convert.ToDecimal(dataGridView2.Rows[i].Cells[6].Value);
                        dataGridView2.Rows[i].Cells[6].Style.BackColor = System.Drawing.Color.Cyan;
                    }
                    else
                    {
                        if (checkBox1.Checked == true)
                        {
                            if (dataGridView2.Rows[i].Cells[1].Value.ToString() == "Saldo Inicial")
                            {
                                soma = soma + Convert.ToDecimal(dataGridView2.Rows[i].Cells[6].Value);
                                dataGridView2.Rows[i].Cells[6].Style.BackColor = System.Drawing.Color.Cyan;
                                textBox3.Text = Convert.ToString(soma);
                            }
                            else
                            {
                                soma = soma - Convert.ToDecimal(dataGridView2.Rows[i].Cells[6].Value);
                                dataGridView2.Rows[i].Cells[6].Style.BackColor = System.Drawing.Color.Coral;
                                textBox3.Text = Convert.ToString(soma);
                            }
                        }
                    }
                }
            }
            textBox3.Text = Convert.ToString(soma);
        }