private void EnterButton_Click(object sender, EventArgs e) { int item = int.Parse(itemTextBox.Text); double weight = Convert.ToDouble(weightTextBox.Text); double amount = item * weight; if (amount <= refg.RemainingWeight) { refg.CalculateWeight(item, weight); currentWeightTextBox.Text = refg.CurrentWeight.ToString(); remainingWeightTextBox.Text = refg.RemainingWeight.ToString(); itemTextBox.Text = ""; weightTextBox.Text = ""; } else { MessageBox.Show("Your Given Amount Cannot be Entered. It will be Overflown."); } }