private void gridChallan_CellContentClick(object sender, DataGridViewCellEventArgs e)
        {
            string Action = this.gridChallan.Columns[e.ColumnIndex].HeaderText;

            if (Action == "Edit")
            {
                frmChildChallan childchallan = new frmChildChallan();
                int             billid       = Convert.ToInt32(gridChallan.Rows[e.RowIndex].Cells[0].Value);
                childchallan.ChallanData   = CommonClass.tblChallanEntryDTO.Where(h => h.SrNo == billid).FirstOrDefault();
                childchallan.FormClosed   += childchallan_FormClosed;
                childchallan.ShowInTaskbar = false;
            }

            if (Action == "Delete")
            {
                try
                {
                    var messageBoxResult = MessageBox.Show("Are you sure want to delete this record?", "Delete", MessageBoxButtons.YesNo);
                    if (messageBoxResult == DialogResult.Yes)
                    {
                        int billid = Convert.ToInt32(gridChallan.Rows[e.RowIndex].Cells[0].Value);
                        tblChallanEntryDTO billdata = CommonClass.tblChallanEntryDTO.Where(h => h.SrNo == billid).FirstOrDefault();
                        CommonClass.tblChallanEntryDTO.Remove(billdata);
                        fillGridData();
                    }
                }
                catch (Exception)
                {
                    MessageBox.Show("Bill already used some where else can't deleted successfully.");
                }
            }
        }
        private void AddEntry_Click(object sender, EventArgs e)
        {
            frmChildChallan childchallan = new frmChildChallan();

            childchallan.FormClosed   += childchallan_FormClosed;
            childchallan.ShowInTaskbar = false;
            childchallan.ShowDialog();
        }