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POHow can I make this program check for multiple things one-at-a-time?
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copied!<p>/<em>At the bottom of this code there are two if statements. I want to be able to check FIRST whether the user has selected a flavor(the text for the flavor textbox is "Select a flavor" by default). If they click the AddDrink button without selecting a flavor, the message box needs to show that they haven't selected a flavor, instead of haven't entered a quantity, and then proceed with the program. However, if they have chosen a flavor but haven't entered a quantity then it should show the message box about entering a quantity. If anymore info is needed please let me know. THANKS FOR YOUR HELP!!!</em>/</p> <pre><code>using System; using System.Collections.Generic; using System.ComponentModel; using System.Data; using System.Drawing; using System.Text; using System.Windows.Forms; namespace Chap9DrinkApp { public partial class Form1 : Form { public Form1() { InitializeComponent(); } private void Form1_Load(object sender, EventArgs e) { } private void ComputeCost_CheckedChanged(object sender, EventArgs e) { } private void btnCompleteOrder_Click(object sender, EventArgs e) { MessageBox.Show(lblFinalFlavor.Text + "\n" + lblFinalTopping.Text + "\n" + lblFinalCost.Text); } private void btnAddDrink_Click(object sender, EventArgs e) { double cost = 0; double quantityPrice; double quantityNum; this.lblFinalTopping.Text = "Extras: "; if (this.radSmall.Checked) { cost += 3.00; } else if (this.radMedium.Checked) { cost += 3.50; } else if (this.radLarge.Checked) { cost += 4.00; } if (this.ckBoxCherries.Checked) { cost += .50; this.lblFinalTopping.Text += "Cherries "; } if (this.ckBoxGrape.Checked) { cost += .50; this.lblFinalTopping.Text += "Grapes "; } if (this.ckBoxLemon.Checked) { cost += .50; this.lblFinalTopping.Text += "Lemon "; } if (this.ckBoxPineapple.Checked) { cost += .50; this.lblFinalTopping.Text += "Pineapple "; } if (this.ckBoxStrawberry.Checked) { cost += .50; this.lblFinalTopping.Text += "Strawberry "; } if (this.ckBoxVitamin.Checked) { cost += .50; this.lblFinalTopping.Text += "Vitamin Pack "; } if (this.ckBoxWhipped.Checked) { cost += .50; this.lblFinalTopping.Text += "Whipped cream "; } this.lblFinalCost.Visible = true; if (this.txtQuantity.Text != "0") { quantityNum = double.Parse(this.txtQuantity.Text); quantityPrice = cost * quantityNum; this.lblFinalCost.Text = "Cost: " + quantityPrice.ToString("c"); } else MessageBox.Show("Please enter a quantity!"); if (this.cmboBoxJuiceFlav.Text != "Select a flavor") this.lblFinalFlavor.Text = "Flavor: " + this.cmboBoxJuiceFlav.Text; else MessageBox.Show("Please select a flavor!"); } } } </code></pre>

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