private void DataGridView2_RowHeaderMouseClick(object sender, DataGridViewCellMouseEventArgs e)
 {
     try
     {
         DataGridViewRow dr = DataGridView2.SelectedRows[0];
         this.Hide();
         frmInvoice frmSales = new frmInvoice();
         frmSales.Show();
         frmSales.txtInvoiceNo.Text    = dr.Cells[0].Value.ToString();
         frmSales.dtpInvoiceDate.Text  = dr.Cells[1].Value.ToString();
         frmSales.txtCustomerID.Text   = dr.Cells[2].Value.ToString();
         frmSales.txtCustomerName.Text = dr.Cells[3].Value.ToString();
         frmSales.txtSubTotal.Text     = dr.Cells[4].Value.ToString();
         frmSales.txtTaxPer.Text       = dr.Cells[5].Value.ToString();
         frmSales.txtTaxAmt.Text       = dr.Cells[6].Value.ToString();
         frmSales.txtTotal.Text        = dr.Cells[7].Value.ToString();
         frmSales.txtTotalPayment.Text = dr.Cells[8].Value.ToString();
         frmSales.txtPaymentDue.Text   = dr.Cells[9].Value.ToString();
         frmSales.btnUpdate.Enabled    = true;
         frmSales.Delete.Enabled       = true;
         frmSales.btnPrint.Enabled     = true;
         frmSales.Save.Enabled         = false;
         frmSales.label6.Text          = label9.Text;
     }
     catch (Exception ex)
     {
         MessageBox.Show(ex.Message, "Error", MessageBoxButtons.OK, MessageBoxIcon.Error);
     }
 }
        private void salesToolStripMenuItem_Click(object sender, EventArgs e)
        {
            this.Hide();
            frmInvoice frm = new frmInvoice();

            frm.label6.Text = lblUser.Text;
            frm.Show();
        }
        private void frmSalesRecord_FormClosing(object sender, FormClosingEventArgs e)
        {
            this.Hide();
            frmInvoice frm = new frmInvoice();

            frm.label6.Text = label9.Text;
            frm.Show();
        }
        private void dataGridView1_RowHeaderMouseClick(object sender, DataGridViewCellMouseEventArgs e)
        {
            try{
                DataGridViewRow dr = dataGridView1.SelectedRows[0];
                this.Hide();
                frmInvoice frm = new frmInvoice();
                frm.Show();
                frm.txtCustomerID.Text   = dr.Cells[0].Value.ToString();
                frm.txtCustomerName.Text = dr.Cells[1].Value.ToString();
                frm.label6.Text          = label1.Text;
            }

            catch (Exception ex)
            {
                MessageBox.Show(ex.Message, "Error", MessageBoxButtons.OK, MessageBoxIcon.Error);
            }
        }