Question

Invoice Total Calculator

Enter the values below and click "Calculate".

Customer Type:
Invoice Subtotal:
Discount Percent: %
Discount Amount:
Invoice Total:

Answer 1

Here is code in C#:

InvoiceCalculator.cs:

using System;
using System.Windows.Forms;

namespace WindowsFormsApp
{
public partial class InvoiceCalculator : Form
{
public InvoiceCalculator()
{
InitializeComponent();
}

private void btnCalculate_Click(object sender, EventArgs e)
{
double invSub = double.Parse(txtInvSub.Text);
double perc = double.Parse(txtPerc.Text);
double discount = invSub * (perc / 100);
txtDisAmount.Text = discount.ToString();
txtInvTotal.Text = (invSub - discount).ToString();
}
}
}

InvoiceCalculator.Designer.cs:

namespace WindowsFormsApp
{
partial class InvoiceCalculator
{
/// <summary>
/// Required designer variable.
/// </summary>
private System.ComponentModel.IContainer components = null;

/// <summary>
/// Clean up any resources being used.
/// </summary>
/// <param name="disposing">true if managed resources should be disposed; otherwise, false.</param>
protected override void Dispose(bool disposing)
{
if (disposing && (components != null))
{
components.Dispose();
}
base.Dispose(disposing);
}

#region Windows Form Designer generated code

/// <summary>
/// Required method for Designer support - do not modify
/// the contents of this method with the code editor.
/// </summary>
private void InitializeComponent()
{
this.label1 = new System.Windows.Forms.Label();
this.txtCusType = new System.Windows.Forms.TextBox();
this.btnCalculate = new System.Windows.Forms.Button();
this.txtInvSub = new System.Windows.Forms.TextBox();
this.label2 = new System.Windows.Forms.Label();
this.txtPerc = new System.Windows.Forms.TextBox();
this.label3 = new System.Windows.Forms.Label();
this.txtDisAmount = new System.Windows.Forms.TextBox();
this.label4 = new System.Windows.Forms.Label();
this.txtInvTotal = new System.Windows.Forms.TextBox();
this.label5 = new System.Windows.Forms.Label();
this.SuspendLayout();
//
// label1
//
this.label1.AutoSize = true;
this.label1.Location = new System.Drawing.Point(23, 19);
this.label1.Name = "label1";
this.label1.Size = new System.Drawing.Size(78, 13);
this.label1.TabIndex = 0;
this.label1.Text = "Customer Type";
//
// txtCusType
//
this.txtCusType.Location = new System.Drawing.Point(129, 16);
this.txtCusType.Name = "txtCusType";
this.txtCusType.Size = new System.Drawing.Size(100, 20);
this.txtCusType.TabIndex = 1;
//
// btnCalculate
//
this.btnCalculate.Location = new System.Drawing.Point(90, 168);
this.btnCalculate.Name = "btnCalculate";
this.btnCalculate.Size = new System.Drawing.Size(75, 23);
this.btnCalculate.TabIndex = 2;
this.btnCalculate.Text = "Calculate";
this.btnCalculate.UseVisualStyleBackColor = true;
this.btnCalculate.Click += new System.EventHandler(this.btnCalculate_Click);
//
// txtInvSub
//
this.txtInvSub.Location = new System.Drawing.Point(130, 46);
this.txtInvSub.Name = "txtInvSub";
this.txtInvSub.Size = new System.Drawing.Size(100, 20);
this.txtInvSub.TabIndex = 4;
//
// label2
//
this.label2.AutoSize = true;
this.label2.Location = new System.Drawing.Point(23, 49);
this.label2.Name = "label2";
this.label2.Size = new System.Drawing.Size(84, 13);
this.label2.TabIndex = 3;
this.label2.Text = "Invoice Subtotal";
//
// txtPerc
//
this.txtPerc.Location = new System.Drawing.Point(129, 72);
this.txtPerc.Name = "txtPerc";
this.txtPerc.Size = new System.Drawing.Size(100, 20);
this.txtPerc.TabIndex = 6;
//
// label3
//
this.label3.AutoSize = true;
this.label3.Location = new System.Drawing.Point(23, 75);
this.label3.Name = "label3";
this.label3.Size = new System.Drawing.Size(89, 13);
this.label3.TabIndex = 5;
this.label3.Text = "Discount Percent";
//
// txtDisAmount
//
this.txtDisAmount.Location = new System.Drawing.Point(129, 98);
this.txtDisAmount.Name = "txtDisAmount";
this.txtDisAmount.ReadOnly = true;
this.txtDisAmount.Size = new System.Drawing.Size(100, 20);
this.txtDisAmount.TabIndex = 8;
//
// label4
//
this.label4.AutoSize = true;
this.label4.Location = new System.Drawing.Point(22, 98);
this.label4.Name = "label4";
this.label4.Size = new System.Drawing.Size(88, 13);
this.label4.TabIndex = 7;
this.label4.Text = "Discount Amount";
//
// txtInvTotal
//
this.txtInvTotal.Location = new System.Drawing.Point(130, 123);
this.txtInvTotal.Name = "txtInvTotal";
this.txtInvTotal.ReadOnly = true;
this.txtInvTotal.Size = new System.Drawing.Size(100, 20);
this.txtInvTotal.TabIndex = 10;
//
// label5
//
this.label5.AutoSize = true;
this.label5.Location = new System.Drawing.Point(23, 126);
this.label5.Name = "label5";
this.label5.Size = new System.Drawing.Size(69, 13);
this.label5.TabIndex = 9;
this.label5.Text = "Invoice Total";
//
// InvoiceCalculator
//
this.AutoScaleDimensions = new System.Drawing.SizeF(6F, 13F);
this.AutoScaleMode = System.Windows.Forms.AutoScaleMode.Font;
this.ClientSize = new System.Drawing.Size(267, 219);
this.Controls.Add(this.txtInvTotal);
this.Controls.Add(this.label5);
this.Controls.Add(this.txtDisAmount);
this.Controls.Add(this.label4);
this.Controls.Add(this.txtPerc);
this.Controls.Add(this.label3);
this.Controls.Add(this.txtInvSub);
this.Controls.Add(this.label2);
this.Controls.Add(this.btnCalculate);
this.Controls.Add(this.txtCusType);
this.Controls.Add(this.label1);
this.Name = "InvoiceCalculator";
this.Text = "InvoiceCalculator";
this.ResumeLayout(false);
this.PerformLayout();

}

#endregion

private System.Windows.Forms.Label label1;
private System.Windows.Forms.TextBox txtCusType;
private System.Windows.Forms.Button btnCalculate;
private System.Windows.Forms.TextBox txtInvSub;
private System.Windows.Forms.Label label2;
private System.Windows.Forms.TextBox txtPerc;
private System.Windows.Forms.Label label3;
private System.Windows.Forms.TextBox txtDisAmount;
private System.Windows.Forms.Label label4;
private System.Windows.Forms.TextBox txtInvTotal;
private System.Windows.Forms.Label label5;
}
}

Output: