protected void Btn_calculate_Click(object sender, EventArgs e)
 {
     if (string.IsNullOrEmpty(txt_weight.Text) || string.IsNullOrEmpty(txt_time.Text) || string.IsNullOrEmpty(txt_amount.Text) ||
         string.IsNullOrEmpty(txt_servings.Text) || string.IsNullOrEmpty(txt_servings.Text) || string.IsNullOrEmpty(DropDownListGender.ToString()))
     {
         MsgBox("All fields need to be full!");
     }
     else
     {
         resultBAC = BACcalculator.countBloodAlcoholContent(convertedWeight, convertedAmount, inputTime,
                                                            inputAlcohol, r, inputServings);
         note = BACcalculator.bacResultMessage(resultBAC);
         //Console.Write(note);
         MsgBox(note);
     }
 }
        protected void Btn_save_Click(object sender, EventArgs e)
        {
            Double.TryParse(txt_weight.Text, out inputWeight);
            if (inputWeight < 0 || inputWeight > 500)
            {
                MsgBox("Your weight can't be negative, please correct it.");
            }
            else
            {
                convertedWeight = BACcalculator.convertWeightToPounds(inputWeight);
            }

            Double.TryParse(txt_time.Text, out inputTime);
            if (inputTime < 0 || inputTime > 24)
            {
                MsgBox("Time input is wrong, please correct it");
            }

            Double.TryParse(txt_alcohol.Text, out inputAlcohol);
            if (inputAlcohol < 0 || inputAlcohol > 100)
            {
                MsgBox("Percentage of alcohol can't be less tha 0% or more than 100%, please correct it");
            }

            Double.TryParse(txt_amount.Text, out inputAmount);
            if (inputAmount < 0)
            {
                MsgBox("Consumed amount of beverage can't be negative, please correct it");
            }
            else
            {
                convertedAmount = BACcalculator.convertAmountToOunces(inputAmount);
            }

            int.TryParse(txt_servings.Text, out inputServings);
            if (inputServings < 0)
            {
                MsgBox("Total number of servings can't be negative, please correct it");
            }

            if (DropDownListGender.SelectedIndex == -1)
            {
                MsgBox("You have to select your gender");
            }
            else if (DropDownListGender.SelectedItem.ToString() == "Female")
            {
                r = 0.66;
            }

            else if (DropDownListGender.SelectedItem.ToString() == "Male")
            {
                r = 0.73;
            }

            if (string.IsNullOrEmpty(txt_weight.Text) || string.IsNullOrEmpty(txt_time.Text) || string.IsNullOrEmpty(txt_amount.Text) ||
                string.IsNullOrEmpty(txt_servings.Text) || string.IsNullOrEmpty(txt_servings.Text) || string.IsNullOrEmpty(DropDownListGender.ToString()))
            {
                MsgBox("All fields need to be full!");
            }
            else
            {
                MsgBox("All data is successfully saved, you can now calculate your BAC");
            }
        }