/// <summary>
        /// Method to Insert Record in the Excel
        /// S1. If the EmpNo =0, then the Operation is Skipped.
        /// S2. If the Employee is already exist, then it is taken for Update
        /// </summary>
        /// <param name="Emp"></param>
        public async Task<bool> InsertOrUpdateRowInExcelAsync(Employee Emp)
        {
            bool IsSave = false;
            //S1
            if (Emp.EmpNo != 0)
            {
                await Conn.OpenAsync();
                Cmd = new OleDbCommand();
                Cmd.Connection = Conn;
                Cmd.Parameters.AddWithValue("@EmpNo", Emp.EmpNo);
                Cmd.Parameters.AddWithValue("@EmpName", Emp.EmpName);
                Cmd.Parameters.AddWithValue("@Salary", Emp.Salary);
                Cmd.Parameters.AddWithValue("@DeptName", Emp.DeptName);
                //S2
                if (!CheckIfRecordExistAsync(Emp).Result)
                {
                    Cmd.CommandText = "Insert into [Sheet1$] values (@EmpNo,@EmpName,@Salary,@DeptName)";
                }
                else
                {
                    if (Emp.EmpName != String.Empty || Emp.DeptName != String.Empty)
                    {
                        Cmd.CommandText = "Update [Sheet1$] set EmpNo=@EmpNo,EmpName=@EmpName,Salary=@Salary,DeptName=@DeptName where EmpNo=@EmpNo";
                    }
                }
                int result = await Cmd.ExecuteNonQueryAsync();
                if (result > 0)
                {
                    IsSave = true;
                }
                Conn.Close();
            }
            return IsSave;

        }
 /// <summary>
 /// Select the Recod for the Update
 /// </summary>
 /// <param name="sender"></param>
 /// <param name="e"></param>
 private void dgEmp_SelectionChanged(object sender, SelectionChangedEventArgs e)
 {
     emp = dgEmp.SelectedItem as Employee;
 }
 /// <summary>
 /// The method to check if the record is already available 
 /// in the workgroup
 /// </summary>
 /// <param name="emp"></param>
 /// <returns></returns>
 private async Task<bool> CheckIfRecordExistAsync(Employee emp)
 {
     bool IsRecordExist = false;
     Cmd.CommandText = "Select * from [Sheet1$] where EmpNo=@EmpNo";
     var Reader = await Cmd.ExecuteReaderAsync();
     if (Reader.HasRows)
     {
         IsRecordExist = true;
     }
      
     Reader.Close();
     return IsRecordExist;
 }