private void button2_Click(object sender, EventArgs e)
        {
            textBox3.Text            = "";
            dataGridView1.DataSource = null;

            if (String.IsNullOrEmpty(label6.Text) == false)
            {
                decimal soma = 0;
                int     cont = 0;
                dataGridView1.DataSource = DALCadastro.FluxoVendaTudo(monthCalendar1.SelectionStart.Date.ToShortDateString());
                if (dataGridView1.Rows.Count > 0)
                {
                    for (int i = 0; i < dataGridView1.Rows.Count; i++)
                    {
                        string prazo1 = dataGridView1.Rows[i].Cells[1].Value.ToString();
                        if (prazo1 == "a prazo")
                        {
                            cont++;
                        }
                        if (prazo1 == "a prazo_parcial")
                        {
                            cont++;
                        }
                        if (prazo1 == "Pagamento Misto")
                        {
                            cont++;
                        }
                        if (cont == 0)
                        {
                            soma += Convert.ToDecimal(dataGridView1.Rows[i].Cells[5].Value);
                            dataGridView1.Rows[i].Cells[5].Style.BackColor = System.Drawing.Color.Cyan;
                        }
                        cont = 0;
                    }
                    textBox3.Text = Convert.ToString(soma);
                }
                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);
            }
            else
            {
                MessageBox.Show("Selecione uma Data");
            }
        }